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Which statement about entry into a space that has been sealed for a long time is TRUE ________．
A.A tank that has been used to carry hazardous liquids should be tested for oxygen content，toxicity，and explosive gases
B.You can safely enter the space without a breathing apparatus if the oxygen content exceeds 14%
C.The natural ventilation through the installed vents is sufficient to provide the proper oxygen content
D.The heat of the sun on upper ballast tanks，such as in a bulk carrier，may generate carbon monoxide
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更多 “ Which statement about entry into a space that has been sealed for a long time is TRUE ________．A.A tank that has been used to carry hazardous liquids should be tested for oxygen content，toxicity，and explosive gasesB.You can safely enter the space without a breathing apparatus if the oxygen content exceeds 14%C.The natural ventilation through the installed vents is sufficient to provide the proper oxygen contentD.The heat of the sun on upper ballast tanks，such as in a bulk carrier，may generate carbon monoxide ” 相关考题
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A tank has been sealed and unventilated(不通风的) for a long period of time. Which of the following conditions does this indicate?A.The tank is safe to enterB.The tank is especially dangerous to enterC.Carbon monoxide(一氧化物) is presentD.Water vapor present when the tank was sealed has oxidized(使氧化)
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D.it has no government.
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Which of the following statements about Armold Schwarzenegger is TRUE？( ) A.He was elected governor of California 10 years ago.
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D.He has troubles with his two daughters and two sons.
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单选题Which statement about stowing spare hose is TRUE（）.A
Fold the hose so that the male coupling is about 4 feet from the female coupling，then roll it upB
Roll the hose starting at the female endC
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Oracle determines when an adaptive threshold has been breached based on the maximum value captured by the baseline.D
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单选题A tank which has been sealed for a long period of time can be dangerous because （）.A
steel surfaces consume oxygen by rustingB
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moisture condenses in the tank, displacing the oxygenD
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单选题Which statement about the hospital space on a cargo ship is TRUE（）.A
The hospital may be used for disciplinary confinement if it is not being used for treatmentB
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单选题我们的重吊杆已经长时间不用了。（）A
Our derrick has been out of use for a long time.B
Our heavy derrick has been out of use for a long time.C
Our crane has been out of use for a long time.D
Our winch has been out of use for a long time.
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单选题Which statement is true about the UNDO_RETENTION parameter when retention guarantee is notenabled（）A
It is the time period after which the undo data becomes obsolete.B
It is the time period after which the committed undo data would be transferred to a temporarytablespace.C
It is the minimum time period up to which the committed undo data would be retained if free undo spaceis available.D
It is the time period after which the undo data is transferred to the Flash Recovery Area to provide readconsistency.
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单选题Which statement is true about the UNDO_RETENTION parameter when retention guarantee is not enabled（）A
It is the time period after which the undo data becomes obsolete.B
It is the time period after which the committed undo data would be transferred to a temporary tablespace.C
It is the minimum time period up to which the committed undo data would be retained if free undo space isavailable.D
It is the time period after which the undo data is transferred to the Flash Recovery Area to provide readconsistency.
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单选题A tank has been sealed and unventilated for a long period of timeWhich of the following conditions does this indicate?（）A
The tank is safe to enterB
The tank is especially dangerous to enterC
Carbon monoxide is presentD
Water vapor present when the tank was sealed has oxidized
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单选题Which statement is true regarding synonyms?（）A
Synonyms can be created only for a table B
Synonyms are used to reference only those tables that are owned by another user C
A public synonym and a private synonym can exist with the same name for the same table D
The DROP SYNONYM statement removes the synonym, and the table on which the synonym has been created becomes invalid
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单选题A switch has been configured with two vlans and is connected to a router with a trunk for inter-vlan routing.OSPF has been configured on the router，as the routing protocol for the network.Which statement about thisnetwork is true？（）A
For the two vlans to communicate，a network statement for the trunk interface needs to be added to the OSPF configuration.B
For the two vlans to communicate， a network statement for each subinterface needs to be added to the OSPF configuration.C
Direct inter-vlan communication does not require OSPFD
OSPF cannot be used if router-on-a-stick is configured on the router
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