worn valve seats
worn main bearing
excessive valve clearance
weak rocker arm springs
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第3题:
A.fond
B.concerned
C.keen
D.interested
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第8题:
In an operating diesel engine, which of the following conditions is an indication of a leaking air starting valve?
A.Noise coming from that air starting valve
B.Continuous operation of the starting air compressor
C.Zero air pressure in the air starting system
D.Overheated starting air pipe to the cylinder head
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第10题: