单项选择题
Close the port side （）(通风口) .
A.ventilators B. designated station C. fire outfit
单项选择题 The emergency alarm is sounded on （）(汽笛) according to master’s order.
单项选择题 There is a smell of gas in the hold. You must wear your （）(氧气面罩).
单项选择题 Prepare for （）(弃货) cargo.
