单项选择题
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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Increased internal leakage, in addition to poor hydraulic system response,and inadequate lubrication, is the result of （）.
A.pump bearings in poor condition
B.excessively worn actuator-piston packing
C.broken directional control valve centering springs
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A.a spring
B.an electromagnet
C.the force of gravity
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When normal operating pressure is applied to the hydraulic oil used in a high-pressure system, the oil （）.
A.viscosity will decrease
B.volume will increase
C.volume will decrease
D.pour point will be reduced
