單項(xiàng)選擇題The common method of applying oil to the cylinder walls is by means of small pump assembled in units, known as （）.

A.mechanical lubricator
B.lubrication function
C.forced feed system
D.bearing lubrication


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1.單項(xiàng)選擇題The cleaned heated oil, after passing through the centrifuges, is to be pumped to a （）.

A.settling tank
B.service tank
C.ballast tank
D.drain tank

2.單項(xiàng)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

3.單項(xiàng)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

4.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

5.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