单项选择题
We should hoist national flag（）（按时）.
A. on time B. in time C. soon D. at times
单项选择题 They will take（）(措施) against pirates and pilferage.
单项选择题 You should adjust the mooring lines according to the changes of（）(吃水).
单项选择题 Take down Flag “G” and（）(升) Flag “H”.
