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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

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單項(xiàng)選擇題

AFTER DROPPING THE PILOT means （）.

A.After boarding the pilot
B.After the pilot leaving the ship
C.After the pilot going on board
D.After taking the pilot

單項(xiàng)選擇題

Above-normal tides near the center of a hurricane maybe caused by the （）.

A.high barometric pressure
B.jet stream
C.storm surge
D.torrential rains