單項(xiàng)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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1.單項(xiàng)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

3.單項(xiàng)選擇題() is the removal of exhaust gases by blowing in fresh air.

A.Gas exchange
B.Charging
C.Scavenging
D.Supercharging

4.單項(xiàng)選擇題() is sometimes used for piston cooling since leaks into the crankcase would not cause problems.

A.Diesel oil
B.Hydraulic oil
C.Lube oil
D.Mineral oil

5.單項(xiàng)選擇題() fuel oils () lubricating oils require treatment before passing to the engine.

A.Both;and
B.Neither;nor
C.Either;or
D.Both;or