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單項選擇題

（） of an engine crankshaft can be detected by measuring deflections of crank webs for each unit of the engine.

A.Misalignment
B.Length
C.Strength
D.Stresses

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單項選擇題

（） may be the first possible cause which makes the engine to lose power or slow down when it is running.

A.Hot bearing
B.Starting valves
C.Unequal distribution of load
D.Excessive crankshaft clearance

單項選擇題

（） is used for cylinder and cylinder head, the salt water is used for cooling the lubricating oil, the fresh water in the coolers and the charging air in the air cooler.

A.The fuel oil
B.The lube oil
C.The sea water
D.The fresh water