单项选择题
This is deck cargo. （）stow it in the holds.
A.Not B.Notto C.Don’t D.Can
单项选择题 Before leaving the harbour, all derricks must be （）properly.
单项选择题 （）operation, any obstacles in the way of hatches must be removed and cleaned.
单项选择题 Each （）consists of two or more panels.
