单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
The burning of the fuel adds more heat to the air charge, causing it to expand and force the engine piston to do work on the crankshaftWhat does “it” mean in this sentence?（）
A.the burning
B.the fuel
C.the air charge
D.the engine piston
