单项选择题
“How do you read?” “I read you four”（）.
A.excellent B.bad C.fair D.good
单项选择题 “Full speed ahead” and “Full speed astern” are（）given by the officers or the pilots.
单项选择题 （）port anchor，one shackle in water.
单项选择题 You must（）your cable to 5 shackles.
