问题描述：
[单选]
The oil is drawn from a drain tank through（）， one of a pair of pumps， into one of fine filters．
A．a strain tank
B．a head tank
C．a service tank
D．a strainer
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答案解析：无
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上一篇：The oil quantity for bearing lubrication should be applied in such an amount as to be sufficient to carry away the（）caused by the friction at the bearings．
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