單項選擇題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


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題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

5.單項選擇題The auxiliary engine and a cgenerator can be connected with ().

A.cam
B.crosshead
C.bulge
D.coupling