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What is TRUE when operating in fog and other vessels are detected by radar?（）.
A. You should make an ample change to port for a vessel crossing on the starboard bow
B. You should maneuver in ample time if a close-quarters situation is developing
C. You should determine the course and speed of all radar contacts at six minute intervals
D. Long-range scanning will provide early warning of ALL other vessels within the radar's range
We have to point out that the postponement of the fulfilment of the contract（）caused us certain expenses.
A. had
B. have
C. has
D. having
一般来讲，生态旅游环境容量理论推测法有两种类型：单项推测法和综合推测法。
A. 正确
B. 错误
信息帧是每个应答器的唯一标识
A. 正确
B. 错误
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