问题描述：
[单选]
The rate of cylinder lubricating oil metered to each cylinder of a large low-speed main propulsion diesel engine is（）
A．the same, whether at sea, or during maneuvering
B．adjusted during each hour of operation while at constant RPM
C．higher at sea than while maneuvering
D．lower at sea than while maneuvering
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答案解析：无
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