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單項(xiàng)選擇題

Which characteristic or condition will have the greatest effect on increasing a hydraulic oils viscosity?（）

A.Pour point
B.Cloud point
C.Vacuum
D.Pressure

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單項(xiàng)選擇題

When there is no movement of the rams on an electro-hydraulic steering gear, the tilting box of the running pump is （）.

A.set for maximum torque
B.on the purge and vent stroke
C.in the neutral position
D.rotating backwards

單項(xiàng)選擇題

The structural members of the hull extending in a fore and aft direction are called （）.

A.frames
B.joiners
C.longitudinals
D.knees

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