单选题When the engine room is put in standby condition, the engineer in charge of the watch need not to（）Aensure all machinery which may be used during maneuvering is in readyBensure an adequate reserve of power is available for steering gear and other requirementsCkeep the main propulsion unit controls continuously attended when in the manual mode of operationDensure all machinery which may be used during maneuvering is running stably
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 ready
B
ensure an adequate reserve of power is available for steering gear and other requirements
C
keep the main propulsion unit controls continuously attended when in the manual mode of operation
D
ensure all machinery which may be used during maneuvering is running stably
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