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1 水手長(zhǎng)，我們?yōu)槭裁匆_艙蓋?（）

2 That is the （）(有毒的)cargo.

3 According to the customs of the port, hatch covers are to be operated by （）.

4 Before （）the harbour, all derricks must be secured properly.

5 As a sailor on duty you must know how to adjust derrick.（）

水手英語(yǔ)甲板值班單項(xiàng)選擇題每日一練(2019.01.21)