现代社会，科学传播不可能起到 的效果，如果谁这样想，谁就会____科学，最终将会危害科学。

A vessel will NOT show sidelights when ().

A.underway but not making way

B.making way，not under command

C.not under command，not making way

D.trolling underway

you on your starboard beam.Which statement is TRUE ()

A.Your vessel is obligated to stay out of the way

B.The other vessel must give way，since your vessel is stopped

C.You should be showing the lights or shapes for a vessel not under command

D.You should be showing the lights or shapes for a vessel restricted in her ability to maneuver

A vessel not under command shall display ______.

A.two red lights at night and two black balls during daylight

B.two red lights at night and three black balls during daylight

C.three red lights at night and two black balls during daylight

D.three red lights at night and three black balls during daylight

Vessel engaged in the launching or recovery of aircraft is called ().

A.A vessel restricted in her ability to maneuver

B.A vessel not under command

C.A vessel constrained by her draught

D.A vessel not under way

A vessel engaged in mine clearance operations is called ______.

A.a vessel restricted in her ability to maneuver

B.a vessel not under command

C.a vessel constrained by her draught

D.a vessel not under way

The Rules state that a seaplane shall ().

A.not be regarded as a vessel

B.in general，keep well clear of all vessels

C.proceed at a slower speed than surrounding vessels

D.when making way，show the lights for a vessel not under command

A vessel not under command sounds the same fog signal as a vessel ______.

A.engaged in towing

B.constrained by her draft

C.under sail

D.All of the above

______.

A.not under command

B.engaged on pilotage duty

C.restricted in her ability to maneuver

D.engaged in fishing

these Rules and is therefore unable to keep out of the way of another vessel is called ______.

A.a vessel restricted in her ability to maneuver

B.a vessel not under command

C.a vessel engaged in fishing

D.a vessel constrained by her draught.

the following vessels EXCEPT a vessel ______.

A.not under command

B.retricted in her ability to maneuver

C.engaged in towing

D.Fishing