A sound signal of seven short blasts and one long blast give

If you do NOT understand the course or intention of an approaching vessel you should sound ___________.

A.one short blast

B.one prolonged blast

C.not less than five short blasts

D.not less than five prolonged blasts

In which case would an overtaking vessel sound a whistle signal of two prolonged followed by one short blast? ______.

A.When overtaking in restricted visibility

B.When overtaking in a narrow channel

C.When overtaking on open waters

D.When no other vessels are in the immediate area

You are on international waters during a heavy rainstorm and hear a vessel sounding a fog signal of one prolonged blast followed by two short blasts． Which of the following could it be？Ⅰ．A vessel laying submarine cable making way．Ⅱ．A pilot vessel on station at anchor．

A.Ⅰ only

B.Ⅱ only

C.Either Ⅰ or Ⅱ

D.Neither Ⅰ nor Ⅱ

If you hear more than six short blasts and one long blast of the whistle supplemented by the same signal on the general alarm, you should ______.

A.start the fire pump

B.go to your man overboard station

C.go to your lifeboat station

D.stand by for collision

On the high seas，a fog signal consisting of one prolonged blast followed by four short blasts would indicate the presence of a ______.

A.vessel being towed

B.fishing vessel engaged in trawling

C.vessel at anchor warning you of her location

D.power-driven pilot vessel on station underway