问题描述：
[单选]
The position of the interface between oil and water within the centrifuge is achieved by the use of（）．
A．gravity disc
B．centrifugal bowl
C．a stack of discs
D．main sealing ring
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答案解析：无
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上一篇：The position of the piston parts in relation to each other is secured by means of（）and a dowel pin in the crown．
下一篇：The ports are drilled in the liners at an angle of approx 20℃ the result being that（）is given a rotary movement．
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