单选题A fog signal consisting of one prolonged blast followed by four short blasts would indicate thepresence of a（）.A vessel being towedB fishing vessel engaged in trawlingC vessel at anchor warning of her locationD power-driven pilot vessel on station unde

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

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

The alarm signal for engine room catching fire is a blast of random bell followed by____.

A.two knocks

B.three Blocks

C.four knocks

D.five knocks

Approaching a anchorage in fog, you hear one short, one prolonged, and one short blast in that sequence on a ship’s whistle. This indicates ______.

A.A vessel towed

B.A vessel not under command and unable to maneuver.

C.A vessel anchored giving warning of her position.

D.A vessel stopped dead in the water.

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