單項選擇題

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

A.the connecting rod
B.the cross-head
C.the piston rod
D.the air box

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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

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