问题
单项选择题
A system of cleaning the tanks by washing them with the cargo of crude oil while it is being discharged is known as（）.
A.cow
B.lot
C.cbt
答案
参考答案：A
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A system of cleaning the tanks by washing them with the cargo of crude oil while it is being discharged is known as（）.
A.cow
B.lot
C.cbt
参考答案：A
