单选题
发布日期:2021-03-22
manoeuvring operations
bad combustion
cooling
mooring trial
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()的作用是限制液压系统的最高压力,对液压系统起防止过载的作用
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(), the second one will start automatically.
(), the second one will start automatically.
A hydraulic motor may be driven by ().
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For a propeller direct driven by the engine,().
Camshafts are usually driven by timing gears or ().