单项选择题
(A)1.0~1.5m (B)1.0~2.0m (C)1.5~2.0m (D)2.0m以上
(A)1/4周 (B)1/2周 (C)1周 (D)2周
(A)齿轮泵 (B)真空泵 (C)管道泵 (D)螺杆泵
(A)单吸螺杆泵 (B)双吸螺杆泵 (C)三吸螺杆泵 (D)多吸螺杆泵
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