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單項(xiàng)選擇題

The selection of an oil depends （） on the operating conditions, the design of the engine and the type of fuel to be burned.

A.to a great extent
B.on a great extent
C.on mainly
D.on only

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單項(xiàng)選擇題

The selection of a lubricating oil depends to a great extent on the operating conditions,（）.

A.the type of coolant
B.the design of the engine
C.the type of fuel to be burned
D.B and C

單項(xiàng)選擇題

The sealing rings are in four parts and pressed together around the piston rods by means of （）.

A.nuts
B.bolts
C.coil springs
D.stuffing boxes

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