单项选择题
When we meet a（军舰）（）, we should lower national flag.
A. warship B. boat C. container ship D. bulk carrier
单项选择题 PSC officers will come on board for(检查)（）next Monday.
单项选择题 They will take measures against (海盗)（）and pilferage.
单项选择题 （）（降一点儿）the gangway, please.
