A、Snowfall or blowing snow
B、Lack of ability to estimate distance
C、Harsh contrast between sun-illuminated snow cover and the background
D、Hazy horizons with extensive mirage effects
更多“During a period of “whiteout”，you should expect which of the following?（）”相关的问题
A、A.the period of time during which no trouble occurs to the engine B、B.no trouble will occur to the engine all its life C、C.trouble may occur freely to the engine D、D.no matter what you do to the engine, no trouble will occur during this period
A、loss of pay during the period of such use B、reprimand by the US Coast Guard C、revocation of license or certificate D、termination of employment
A、this was the period of large inflow of young immigrants B、this was the birth age of the baby boomers. C、the large number born during WW II reached this age bracket D、those who were born in the period of baby boom reached this age bracket
A、Wet clothes during the day to decrease perspiration B、Get plenty of rest C、Keep the entrance curtains open D、All of the above
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
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
A、crankshaft revolution B、mechanical cycle of operation C、period of two combustion cycles D、cycle of two events
A、above the polar circles B、in a low pressure area C、during periods of low temperatures D、in the doldrums
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