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單項選擇題

The cast iron（）for the cross-head are attached to the top section and seal off the crankcase.

A.cylinder cover
B.cross-head shoes
C.guide-ways
D.scavenging boxes

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單項選擇題

The carbon deposits on the piston crown and in the ring grooves （）.

A.should be scraped
B.should be derusted
C.should be drilled out
D.to be brushed off

單項選擇題

The cap and new shell are tightened up and then removed and the thickness of the wire measured by （）.

A.a bridge gauge
B.a micrometer
C.a thermometer
D.a indicator

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