單項(xiàng)選擇題While underway，in fog，you hear a whistle signal of one prolonged blast followed by two short blasts. This signal is sounded by a vessel（）.

A.not under command
B.being towed
C.on pilotage duty
D.aground


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1.單項(xiàng)選擇題Some lights used as aids to marine navigation have a red sector to indicate a danger area. The limits of a colored sector of a light are listed in the Light List in which of the following manners?（）

A.Geographical positions outlining the area of the sector
B.True bearings as observed from the ship toward the light
C.An outline of the area of the sector
D.True bearings as observed from the light toward the ship

2.單項(xiàng)選擇題Daymarks marking the starboard side of the channel when going towards the sea are（）.

A.green squares
B.green triangles
C.red squares
D.red triangles

3.單項(xiàng)選擇題An occulting light is one in which（）.

A.the period of darkness exceeds the period of light
B.there is only a partial eclipse of the light
C.the periods of light and darkness are equal
D.the period of light exceeds the period of darkness

4.單項(xiàng)選擇題A vessel being towed astern，where the length of the tow exceeds 200 meters，will exhibit （）.

A.two balls in a vertical line
B.a diamond shape where it can best be seen
C.a ball on each end of the tow
D.no dayshape

5.單項(xiàng)選擇題As defined in the Rules，a towing light is a yellow light having the same characteristics as a(n)（）.

A.masthead light
B.all-round light
C.sidelight
D.sternlight

6.單項(xiàng)選擇題A vessel is fishing at anchor on the high seas. Which of the following day signals should she display if she has gear extending out over 150 meters horizontally from the vessel?（）.

A.A black ball in the forepart of her vessel
B.A black double frustum of a cone
C.A basket where best seen
D.A black cone point upwards

7.單項(xiàng)選擇題Environmental loading consists of the forces caused by wind，waves，and（）.

A.drilling
B.soil reactions
C.temperature
D.current

8.單項(xiàng)選擇題A power-driven vessel underway shall keep out of the way of（）.

A.a vessel restricted in her ability to maneuver
B.a vessel under command
C.a passenger ship
D.a seaplane on the water

9.單項(xiàng)選擇題According to the Rules，when should lights be displayed?（）.

A.During the hours of darkness
B.At all times when underway
C.From sunset to sunrise and restricted visibility
D.Sunrise to sunset

10.單項(xiàng)選擇題An inconspicuous，partly submerged vessel or object being towed，where the length of tow is 100 meters，shall show（）.

A.yellow lights at each end
B.two red lights in a vertical line
C.a black ball
D.a diamond shape