单项选择题
The successful operation of any engine or machine and （） depend on effective lubrication.
A.their no trouble period
B.their freely trouble period
C.its free trouble life
D.its trouble-free life
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相关考题
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单项选择题
The starting of a marine diesel engine is generally carried out with the assistance of （）.
A.compressed air
B.electricity
C.hydraulic oil
D.compressing air -
单项选择题
The starting air system usually has （） to prevent starting if anything is not in order.
A.stop valves
B.interlocks
C.non-return valves
D.air vents -
单项选择题
The starting air system usually has （） to prevent starting if anything is not in order.
A.drain cocks
B.vent valves
C.counteracts
D.interlocks
