中国石油大学 / 中石油
正确率：100%
20. Pipe lines can be generally classified into the following catergories as_______________.
A、Gathering lines
B、Trunk/transmissions lines
C、Gas transmission systems
D、Refined product lines
E、Distribution lines
A、Gathering lines
B、Trunk/transmissions lines
C、Gas transmission systems
D、Refined product lines
E、Distribution lines
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