航海英语号灯与号型章节练习(2017.10.27)

单项选择题
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
单项选择题
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
单项选择题
The prohibition against displaying lights which may be confused with required navigation lights applies（）.
A.from sunset to sunrise and during restricted visibility
B.only when other vessels are in the area
C.only when operating in a traffic separation scheme
D.only when under tow
单项选择题
A tug is towing three manned barges in line in fog. The first vessel of the tow should sound （）.
A.no fog signal
B.one short blast
C.one prolonged and three short blasts
D.one prolonged，one short，and one prolonged blast
单项选择题
Approaching an 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
单项选择题
During the day，a vessel with a tow over 200 meters in length will show（）.
A.a black ball
B.a diamond shape
C.two cones，apexes together
D.one cone，apex upward
单项选择题
A vessel towing is showing three forward white masthead lights in a vertical line. This means that the length of the（）.
A.towing vessel is less than 50 meters
B.towing vessel is greater than 50 meters
C.tow is less than 200 meters
D.tow is greater than 200 meters
单项选择题
A power-driven vessel towing another vessel astern (tow less than 200 meters) shall show （）.
A.three masthead lights in a vertical line instead of either the forward or after masthead light
B.two masthead lights in a vertical line instead of either the forward or after masthead lights
C.two towing lights in a vertical line at the stern
D.a small white light aft of the funnel
单项选择题
A power-driven vessel shall have her engine ready for（）when the visibility is restricted.
A.immediately stop
B.immediately maneuvering
C.immediately anchoring
D.immediately going astern
单项选择题
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