题目内容

Permission is requested to pump out about 200 tons of clean sea ballast water for （） purposes．

A. safe manning
B. trimming
C. avoiding collision
D. preventing pollutio

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输水损失

Hello.Is Jim there?（）

A. This is Jim. Who's speaking, please?
B. I'm afraid I won't be free.
C. This is the right number.
D. There's no hurry.

简述实行网络财务意义。

直埋敷设电缆的技术要求有哪些？