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單項選擇題

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

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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

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