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问题 单项选择题

污水排放指标中一级的COD数值正确的是（）。

A、COD≤300mg/L

B、COD≤650mg/L

C、COD≤400mg/L

D、COD≤500mg/L

答案

参考答案：A

选择题

A gift made by one’s own hands is better than ______ bought in a shop.

A．it

B．that

C．one

D．the one
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单项选择题

The muster list shows each rig hand’s muster station，his duties during abandonment，basic instructions，and（）.

A.all emergency signals

B.instructions for lowering the survival craft

C.the time each weekly drill will be held

D.work schedule
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