问题描述：
[单选]
The cleaned heated oil， after passing through the centrifuges， is to be pumped to a（）．
A．settling tank
B．service tank
C．ballast tank
D．drain tank
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答案解析：无
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答案解析：无
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上一篇：The complete assembly of bedplate， A-frames and cylinder block is held together by（）to form a rigid structure．
下一篇：The cast iron guide-ways for（）are attached to the top section and seal off the crankcase．
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