单项选择题
A.PSC B.ARPA C.GPS D.ECDIS
（）（降）the flag.A.HoistB.TopC.LowerD.Bring
单项选择题（）（降）the flag.
A.Hoist B.Top C.Lower D.Bring
You should keep national flag（飘扬）（）.A.flewB.flownC.flyi...
单项选择题You should keep national flag（飘扬）（）.
A.flew B.flown C.flying D.flies
（）（调整）ropes when necessary.A.TryB.AdjustC.NoticeD.Opera...
单项选择题（）（调整）ropes when necessary.
A.Try B.Adjust C.Notice D.Operate
