單項(xiàng)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


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1.單項(xiàng)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

3.單項(xiàng)選擇題The bore of each cylinder is formed in a liner which can be () when worn out.

A.welded
B.replaced
C.drilled again
D.bored

4.單項(xiàng)選擇題The bed-plate is secured in the longitudinal direction by means of bolts known as ().

A.end-chock bolts
B.side-chock bolts
C.through bolts
D.tie rods

5.單項(xiàng)選擇題The bearing shells depend on the accuracy of () to held them in a truly circular shape.

A.the gap
B.the clearance
C.the bore
D.the housing