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航海英語(yǔ)船舶輔機(jī)單項(xiàng)選擇題每日一練(2019.01.07)

單項(xiàng)選擇題
Apparent wind speed blowing across a ship under tow can be measured by a(n)（）.
A.barometer
B.wind vane
C.anemometer
D.thermometer
單項(xiàng)選擇題
As a rule，ships of most configurations，when drifting in calm water with negligible current，will lie（）.
A.bow to the wind
B.beam to the wind
C.stern to the wind
D.with the wind on the quarter
單項(xiàng)選擇題
As compared to carbon dioxide，dry chemical has which advantage?（）
A.Cleaner
B.Effective on metal fires
C.Greater range
D.More cooling effect
單項(xiàng)選擇題
As the temperature of an air mass decreases，the（）.
A.absolute humidity decreases
B.relative humidity increases
C.specific humidity decreases
D.dew point rises
單項(xiàng)選擇題
Any extinguishing agent used on a Class “C” fire must have which important property? （）
A.Cooling ability
B.Leaves no residue
C.Penetrating power
D.Nonconductivity