单项选择题
A.水压大于油压 B.油压大于水压 C.水压与油压应当相等
A.8657~8951r/min B.5517~8275r/min C.8951~9399r/min D.5577~8755r/min
A.1μm B.2μm C.5μm D.10μm
A.1 B.2 C.3 D.4
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