单项选择题
A.the connecting rod B.the cross-head C.the piston rod D.the air box
The cast iron（）for the cross-head are attached to the t...
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
The carbon deposits on the piston crown and in the ring...
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
The cap and new shell are tightened up and then removed...
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
