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单选题
A special device that，when fitted into the rotary table，transmits torque to the kelly and simultaneously permits vertical movement of the kelly to make the hole is called a（）.
A
master bushing
B
kelly slips
C
kelly bushing
D
rotary bushing
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更多 “单选题A special device that，when fitted into the rotary table，transmits torque to the kelly and simultaneously permits vertical movement of the kelly to make the hole is called a（）.A master bushingB kelly slipsC kelly bushingD rotary bushing” 相关考题
考题
Examine this command:SQL exec DBMS_STATS.SET_TABLE_PREFS (‘SH’, ‘CUSTOMERS’, ‘PUBLISH’, ‘false’);Which three statements are true about the effect of this command?()
A. Statistics collection is not done for the CUSTOMERS table when schema stats are gathered.B. Statistics collection is not done for the CUSTOMERS table when database stats are gathered.C. Any existing statistics for the CUSTOMERS table are still available to the optimizer at parse time.D. Statistics gathered on the CUSTOMERS table when schema stats are gathered are stored as pending statistics.E. Statistics gathered on the CUSTOMERS table when database stats are gathered are stored as pending statistics.
考题
Which statement describes transit traffic?()
A. Traffic addressed to the chassis that requires some form of special handling by the RE before it can be forwarded out an egress port.B. Traffic that enters an ingress port, is compared against the forwarding table, and is forwarded out an egress port.C. Any traffic that requires the generation of an ICMP message.D. Traffic that requires some form of special attention and does not pass through the device.
考题
A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a flame ______.A.stopperB.screenC.filterD.restrictor
考题
The __________ method is more fitted to the explicit presentation of grammar when the basic structure is being identified.
A．inductive
B．contrastive
C．comparative
D．deductive
考题
You suspect that a hacker may be performing a MAC address flooding attack somewhere within the network. Which description correctly describes a MAC address flooding attack？（）A、The attacking device spoofs a source MAC address of a valid host currently in the CAM table. The switch then forwards frames destined for the valid host to the attacking device.B、Frames with unique， invalid destination MAC addresses flood the switch and exhaust CAM table space. The result is that new entries cannot be inserted because of the exhausted CAM table space， and traffic is subsequently flooded out all ports.C、The attacking device crafts ARP replies intended for valid hosts. The MAC address of the attacking device then becomes the destination address found in the Layer 2 frames sent by the valid network device.D、The attacking device crafts ARP replies intended for valid hosts. The MAC address of the attacking device then becomes the source address found in the Layer 2 frames sent by the valid network device.E、The attacking device spoofs a destination MAC address of a valid host currently in the CAM table. The switch then forwards frames destined for the valid host to the attacking device.F、Frames with unique， invalid source MAC addresses flood the switch and exhaust CAM table space. The result is that new entries cannot be inserted because of the exhausted CAM table space， and traffic is subsequently flooded out all ports.G、None of the other alternatives apply
考题
属于事务控制的语句是（）。A、Begin Tran、Commit、RollBackB、Begin、Continue、EndC、Create Tran、Commit、RollBackD、Begin Tran、Continue、End
考题
In an Ethernet network, under what two scenarios can devices transmit?（）A、when they receive a special tokenB、when there is a carrierC、when they detect no other devices are sendingD、when the medium is idleE、when the server grants access
考题
When using Device Manager, a red ‘X” indicates which of the following?（）A、Device is disabledB、Device conflictC、No device driver foundD、Device has not been digitally signed
考题
When creating a Virtual Ethernet adapter， which of the following steps is done FIRST？（）A、Generate a unique MAC address.B、Run cfgmgr to create device special files.C、Create a virtual device with "smitty vlan".D、Add a virtual Ethernet adapter to the partition profile.
考题
In which scenario do you use the Flashback Database feature？（）A、 when a table is dropped and you restore it from the Recycle BinB、 when a user’s schema is dropped and you recover the user’s schemaC、 when some incorrect data is inserted in the table and you retrieve the table to a state that was at a certain timestampD、 when a row of a table is updated frequently and committed， and you view all the versions of the row within a specific duration
考题
In which scenario will you perform a user-managed incomplete recovery？（）A、 when a table is dropped and stored in the Recycle BinB、when a table is dropped and purged from the Recycle BinC、 when you are required to recover an existing table to its previous stateD、 when you are required to view all the versions of a row of an existing table between a specific time period
考题
In which scenario will you perform an incomplete recovery？（）A、 when a table is dropped and stored in the Recycle BinB、 when all the control files are deletedC、 when a member of a multiplexed redo log group is droppedD、 when you are required to recover a table to its previous state
考题
单选题You suspect that a hacker may be performing a MAC address flooding attack somewhere within the network. Which description correctly describes a MAC address flooding attack？（）A
The attacking device spoofs a source MAC address of a valid host currently in the CAM table. The switch then forwards frames destined for the valid host to the attacking device.B
Frames with unique， invalid destination MAC addresses flood the switch and exhaust CAM table space. The result is that new entries cannot be inserted because of the exhausted CAM table space， and traffic is subsequently flooded out all ports.C
The attacking device crafts ARP replies intended for valid hosts. The MAC address of the attacking device then becomes the destination address found in the Layer 2 frames sent by the valid network device.D
The attacking device crafts ARP replies intended for valid hosts. The MAC address of the attacking device then becomes the source address found in the Layer 2 frames sent by the valid network device.E
The attacking device spoofs a destination MAC address of a valid host currently in the CAM table. The switch then forwards frames destined for the valid host to the attacking device.F
Frames with unique， invalid source MAC addresses flood the switch and exhaust CAM table space. The result is that new entries cannot be inserted because of the exhausted CAM table space， and traffic is subsequently flooded out all ports.G
None of the other alternatives apply
考题
单选题In which scenario do you use the Flashback Database feature？（）A
when a table is dropped and you restore it from the Recycle BinB
when a user’s schema is dropped and you recover the user’s schemaC
when some incorrect data is inserted in the table and you retrieve the table to a state that was at a certain timestampD
when a row of a table is updated frequently and committed， and you view all the versions of the row within a specific duration
考题
单选题The velocity of a rotary tidal current will be decreased when the Moon is（）.A
at apogeeB
newC
fullD
All of the above
考题
单选题A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a（）.A
flame stopperB
flame screenC
flame filterD
flame restrictor
考题
单选题The connecting rob is fitted between the crosshead and the crankshaftIt transmits the firing force, and together with the crankshaft convert the （） motion to a （） motion.A
rotary；reciprocatingB
up and down；fore and aftC
fore and aft；up and downD
up and down；rotary
考题
单选题When creating a Virtual Ethernet adapter， which of the following steps is done FIRST？（）A
Generate a unique MAC address.B
Run cfgmgr to create device special files.C
Create a virtual device with smitty vlan.D
Add a virtual Ethernet adapter to the partition profile.
考题
单选题Safety goggles or glasses are NOT normally worn when（）.A
using a rotary grinder with an installed shieldB
letting go the anchorC
handling wire rope or natural fiber lineD
painting with a spray gun
考题
单选题Which statement describes transit traffic?（）A
Traffic addressed to the chassis that requires some form of special handling by the RE before it can be forwarded out an egress port.B
Traffic that enters an ingress port, is compared against the forwarding table, and is forwarded out an egress port.C
Any traffic that requires the generation of an ICMP message.D
Traffic that requires some form of special attention and does not pass through the device.
考题
单选题An overspeed safety device is usually fitted to a generator engine for （） in the event of overspeed.A
cutting power off the engineB
increasing the fuel pump settingC
braking the crankshaftD
stabilizing the ship speed
考题
单选题In which scenario will you perform a user-managed incomplete recovery？（）A
when a table is dropped and stored in the Recycle BinB
when a table is dropped and purged from the Recycle BinC
when you are required to recover an existing table to its previous stateD
when you are required to view all the versions of a row of an existing table between a specific time period
考题
多选题Examine this command: SQL exec DBMS_STATS.SET_TABLE_PREFS (‘SH’, ‘CUSTOMERS’, ‘PUBLISH’, ‘false’); Which three statements are true about the effect of this command?（）AStatistics collection is not done for the CUSTOMERS table when schema stats are gathered.BStatistics collection is not done for the CUSTOMERS table when database stats are gathered.CAny existing statistics for the CUSTOMERS table are still available to the optimizer at parse time.DStatistics gathered on the CUSTOMERS table when schema stats are gathered are stored as pending statistics.EStatistics gathered on the CUSTOMERS table when database stats are gathered are stored as pending statistics.
考题
单选题The connecting rod is fitted between the crosshead and the crankshaftI t transmits the firing force, and together with the crankshaft converts the （）motion to a （）motion.A
rotary；reciprocatingB
up and down；fore and aftC
fore and aft；up and downD
up and down；rotary
考题
单选题In which scenario will you perform an incomplete recovery？（）A
when a table is dropped and stored in the Recycle BinB
when all the control files are deletedC
when a member of a multiplexed redo log group is droppedD
when you are required to recover a table to its previous state
考题
单选题A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a flame（）.A
stopperB
screenC
filterD
restrictor
考题
单选题A six-cylinder, two-stroke/cycle diesel engine is fitted with a rotary distributing air starting systemThe speed of the rotating distributor disc is （）A
one-half engine speedB
the same as engine speedC
twice engine speedD
four times engine speed
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