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單項選擇題

The crankshaft deflection is at first to be （） before and after repair.

A.disassembled
B.renewed
C.measured
D.regulated

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單項選擇題

The crank-room cover should not be opened until at least （） minutes after the engine stops.

A.one
B.fifteen
C.sixty
D.ninety

單項選擇題

The crank-room cover should not be opened until at least （） minutes after the engine stops.

A.10
B.15
C.20
D.30

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