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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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

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