航海英语航海气象章节练习(2018.02.28)

单项选择题
Isobars on a synoptic chart are useful in predicting（）.
A.temperature
B.dew point
C.wind velocity
D.relative humidity
单项选择题
Weather forecast messages are usually（）.
A.Given only to TV stations
B.Transmitted only by commercial broadcast stations
C.Broadcast in plain language
D.Broadcast immediately on VHF Channel 16 and 2182 kHz
单项选择题
After a cold front passes the barometric pressure usually（）.
A.fluctuates
B.remains the same
C.remains the same，with clouds forming rapidly
D.rises，often quite rapidly，with clearing skies
单项选择题
The currents are（）mosoonal origin．
A.from
B.on
C.in
D.of
单项选择题
A swift current occurring in a narrow passage connecting two large bodies of water which is produced by the continuously changing difference in height of tide at the two ends of the passage is called a(n)（）.
A.hydraulic current
B.rectilinear current
C.rotary current
D.harmonic current
单项选择题
The fog produced by warm moist air passing over a cold surface is called（）.
A.conduction fog
B.radiation fog
C.frontal fog
D.advection fog
单项选择题
High clouds，composed of small white flakes or scaly globular masses，and often banded together to form a mackerel sky，would be classified as（）.
A.cirrus
B.cirrocumulus
C.altostratus
D.cumulonimbus
单项选择题
Hurricanes may move in any direction．However，it is rare and generally of short duration when a hurricane in the Northern Hemisphere moves toward the（）.
A.West or northwest
B.Northeast
C.Southeast
D.North
单项选择题
When force of winds reaches 10-11 in Beaufort scale，we usually call such wind（）.
A.Gale
B.Storm
C.Hurricane
D.Typhoon
单项选择题
The apparent wind can be zero when the true wind is from（）.
A.ahead and equal to the ship's speed
B.astern and equal to the ship's speed
C.ahead and equal to twice the ship's speed
D.astern and equal to twice the ship's speed