题目
A.lube oil sludge accumulating in it
B.dirt and scale etc , formed on the surfaces
C.deformation of the tubes and the shell or the plates
D.lube oil leakage into sea-water side
第5题
A.whether
B.what
C.that
第8题
第9题
It is those people who ______most angry at what is going on at university campuses.
A. is
B. was
C. were
D. are
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