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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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单选题A tank which has been sealed for a long period of time can be dangerous because （）.A
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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
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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
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