考题
According to the anti -railway group, all the followings are true but ______.A) tunnels are dangerous to public healthB) the noise and the glare of the engine fire may affect people' s nervesC) the rapid speed through the air does damage to people's lungsD) to those with high blood - pressure, the rapid speed of the train causes them to die
考题
What are two way sthat IP datagrams are passed from the ingress line module to the egress line module?()
A.over an ATM PVCB.over a FastEthernet busC.overa Gigabit Ethernet busD.over high speed serial bus
考题
Refer to the exhibit.The actual speed of the serial links between R2 and R3 are 256 kb/s and 512k b/s respectively. When configuring EIGRP on routers R2 and R3, the network administrator configured the bandwidth of both serial interfaces to 512 kb/s. What will be the effect?()A. EIGRP will overutilize the 512 kb/s link.B. The interface delay value used in the EIGRP metric calculation will be inaccurate on the 256k b/s serial interface.C. The amount of bandwidth used for EIGRP routing protocol traffic on the 256 kb/s link can become excessive.D. EIGRP can load balance between the two serial links only if the variance is set to 2 or higher.E. Unequal cost load balancing will be disabled.
考题
A Doppler speed log indicates speed through the water ______.A.at all timesB.in the bottom return modeC.in the volume reverberation modeD.only when there is no current
考题
The owner or Master of a towing vessel shall ensure that each person that directs and controls the movement of the vessel can accomplish all of the following EXCEPT ______.A.evaluate the danger of each closing visual or radar contactB.adjust speed with due regard for the weather and visibilityC.reduce speed only where local speed limits are postedD.enter all required test and inspection results in the vessel's log or other record carried on board
考题
All marine low-speed diesels are of what design ________.A.Four-strokeB.Two-strokeC.Electronic ignitionD.Forced exhaust
考题
EIGRP has been configured to opera te over Frame Relay multipoint connections. What should the bandwidth command be set to?()A、the CIR rate of the lowest speed connection multiplied by the number of circuitsB、the CIR rate of the lowest speed connectionC、the CIR rate of the highest s peed connectionD、the sum of all the CIRs divided by the number of connections
考题
Given the following output: san-port-channel 12 is up Hardware is Fibre Channel Port WWN is 24:0c:00:0d:ec:d3:5c:00 Admin port mode is NP, trunk mode is on Port mode is NP Port vsan is 1 Speed is 8 Gbps Member[1] : fc2/3 Member[2] : fc2/4 What does "Speed is 8 Gbps" indicate?()A、 The speed of the slowest interface in the port channelB、 The combined speed of all interfaces configured in the port channelC、 The combined speed of all interfaces in the port channel that are upD、 The speed that can be achieved if all buffers are used
考题
What is the most common cause of network congestion?()A、aggregation congestion occurring at the core layer where the different distribution layer devices feed traffic to the core-layer switchesB、speed mismatches when moving from a low-speed LAN environment to a higher speed WAN environmentC、flapping Ethernet interfaces caused by misconfigured LAN interfacesD、flapping serial interfaces caused by misconfigured WAN interfacesE、speed mismatches when moving from a high-speed LAN environment to a lower speed WAN environment
考题
单选题What is the most common cause of network congestion?()A
aggregation congestion occurring at the core layer where the different distribution layer devices feed traffic to the core-layer switchesB
speed mismatches when moving from a low-speed LAN environment to a higher speed WAN environmentC
flapping Ethernet interfaces caused by misconfigured LAN interfacesD
flapping serial interfaces caused by misconfigured WAN interfacesE
speed mismatches when moving from a high-speed LAN environment to a lower speed WAN environment
考题
单选题The owner or Master of a towing vessel shall ensure that each person that directs and controls the movement of the vessel can accomplish all of the following EXCEPT().A
evaluate the danger of each closing visual or radar contactB
adjust speed with due regard for the weather and visibilityC
reduce speed only where local speed limits are postedD
enter all required test and inspection results in the vessel's log or other record carried on board
考题
单选题If necessary to avoid collision or allow more time to()the situation,a vessel shall slacken her speed or take all way off by stopping or reversing her means of propulsion.A
accessB
processC
professD
recess
考题
单选题What is a characteristic of all centrifugal cargo pumps? ()A
They are self-primingB
Decreasing the speed of rotation will decrease the discharge pressureC
Opening the discharge valve wider will increase the discharge pressureD
All of the above
考题
单选题In determining safe speed,all of the following must be taken into account EXCEPT the().A
maximum horsepower of your vesselB
presence of background lights at nightC
draft of your vesselD
maneuverability of your vessel
考题
单选题Increasing the speed of a centrifugal pump will result in an increase in its capacity Another means of increasing the capacity of a centrifugal pump is to increase the ().A
diameter of the discharge piping, with all other factors remaining the sameB
diameter of the suction piping, with all other factors remaining the sameC
width of the impeller onlyD
diameter of the impeller
考题
单选题Good seamanship while towing in heavy weather requires all of the following EXCEPT().A
reducing speed to reduce surging on the towlineB
lashing down or stowing all loose gearC
dogging all hatches and watertight doorsD
streaming all of your towing hawser
考题
单选题In conventional systems, the injection pressure(), while it’s()in common rail diesel engines.A
fluctuates with the engine speed to some extent, independent of the engine speedB
keeps constant at all engine speed, dependent on the engine speed to some extentC
keeps constant at all engine speed, independent of the engine speedD
is decided by the engine speed, constant at all engine speed
考题
单选题All event relating to the voyage,such as ship’s position,speed and details of the weather, are recorded in().A
logbookB
Bell bookC
oil record bookD
compass error book
考题
单选题EIGRP has been configured to operate over Frame Relay multipoint connections. What should the bandwidth command be set to?()A
the CIR rate of the lowest speed connection multiplied by the num ber of circuitsB
the CIR rate of the lowest speed connectionC
the CIR rate of the highest speed connectionD
the sum of all the CIRs divided by the number of connections
考题
多选题What are two way sthat IP datagrams are passed from the ingress line module to the egress line module?()Aover an ATM PVCBover a FastEthernet busCovera Gigabit Ethernet busDover high speed serial bus
考题
单选题In order to maintain a safe speed at all times,any necessary alterations of speed must().A
be instantly put onB
be instant put into useC
be instantly put into effectD
be put immediately
考题
单选题Every vessel should at all times proceed at a safe speed. Safe speed is defined as that speed where().A
you can stop within your visibility rangeB
you can take proper and effective action to avoid collisionC
you are traveling slower than surrounding vesselsD
no wake comes from your vessel
考题
单选题Which of the following statements is TRUE regarding automatic identification systems (AIS)? ()A
AIS is a short-range VHF-FM system that automatically broadcasts a vessel's position,course,speed and other safety related information to all those with similar equipment in the areaB
AIS is a one-way centrally managed system that requires the local VTS to send commands to instruct each vessel to broadcast position,course,speed and other safety related information to all those with similar equipment in the areaC
AIS is a global tracking system that relies upon INMARSAT C service to communicate vessel position,course,speed and other safety related information to all those with similar equipment in the areaD
AIS is a short-range 3 cm X-band radar system that automatically sends a vessel's position,course,speed and other safety related information to all those with similar equipment within the area
考题
单选题A vessel must proceed at a safe speed().A
in restricted visibilityB
in congested watersC
during darknessD
at all times
考题
单选题A Doppler speed log indicates speed over ground().A
at all timesB
in the bottom return modeC
in the volume reverberation modeD
only when there is no current
考题
单选题What information will a distress alert contain?()A
nature of distressB
type of assistance requiredC
course and speed and time at which the information was recordedD
A, B, C are all right
考题
单选题Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to ()A
decrease the time required between cleaningsB
removes all large and small foreign objectsC
ensure a positive flow of oil at all timesD
ensure that all lube oil has been treated twice