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单选题
Is extra power available（）emergency while maneuvering?
A
for
B
in
C
during
D
to
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单选题Which statement concerning reserve sources of energy for GMDSS is FALSE（）.A
While the ship is at sea，there must be available at all times a supply of electrical energy sufficient to operate the radio installations and to charge any batteries used as part of a reserve source of energyB
Both the VHF and MF/HF installations must be simultaneously suppliedC
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argo winchB
WindlassC
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a monthB
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in every 6 monthsD
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单选题When the engine room is put in standby condition, the engineer in charge of the watch need not to（）A
ensure all machinery which may be used during maneuvering is in readyB
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单选题On offshore drilling units，emergency lighting and each emergency power system must be tested at least once a（）.A
dayB
weekC
monthD
year
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