Positive displacement, helical gear pumps are well suited for pumping oil because （）<br>A:stuffing boxes eliminate the leakage problems usually associated with other gear pumps<br>B:it is not necessary to closely maintain design clearances with this pump<br>C:they are essentially self-priming and produce a high suction lift<br>D:these pumps are designed with extreme tooth angled

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 angled

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