单项选择题
A.1/2.5 B.1/3 C.1/3.5 D.1/4
A.中破碎 B.粗破碎 C.细破碎 D.粗粉碎
A.柱塞泵 B.齿轮泵 C.螺杆泵 D.滑片泵
A.0.31～0.42 B.0.32～0.45 C.0.33～0.45 D.0.35～0.46
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