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單項(xiàng)選擇題

Cooling （） the engine metals retain their mechanical properties.

A.forces
B.enables
C.makes
D.is able to

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單項(xiàng)選擇題

The data to be recorded on this sheet （） the performance of the engine.

A.makes the experts to judge
B.enables the experts to judge
C.make the experts judging
D.enable the experts to judge

單項(xiàng)選擇題

To assist separation of low viscosity oils steam coils or electric heaters are fitted （） of the oily water separator.

A.in entrance
B.in exit
C.in the upper part
D.on the outside