Positive displacement helical gear pumps are well
Positive displacement, helical gear pumps are well suited for pumping oil because
A.stuffing boxes eliminate the leakage problems usually associated with other gear pumps
B.it is not necessary to closely maintain design clearances with this pump
C.they are essentially self-priming and produce a high suction lift
D.these pumps are designed with extreme tooth angles
请帮忙给出正确答案和分析，谢谢！
参考解答
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2024-06-15 01:19:41
正确答案：C
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