A.should be scraped
B.should be derusted
C.should be drilled out
D.to be brushed off
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A.a bridge gauge
B.a micrometer
C.a thermometer
D.a indicator
A.the burning
B.the fuel
C.the air charge
D.the engine piston
A.welded
B.replaced
C.drilled again
D.bored
A.end-chock bolts
B.side-chock bolts
C.through bolts
D.tie rods
A.the gap
B.the clearance
C.the bore
D.the housing
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In a simple mechanical governor, the （）.
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White smoke exhausting from an operating diesel engine may indicate （）.
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