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單項(xiàng)選擇題

The characteristic of a lighted cardinal mark may be （）.

A.very quick flashing
B.flashing
C.fixed
D.occulting

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單項(xiàng)選擇題

Temperature and moisture characteristics are modified in a warm or cold air mass due to （）.

A.pressure changes in the air mass
B.movement of the air mass
C.the heterogeneous nature of the air mass
D.upper level atmospheric changes

單項(xiàng)選擇題

Please wireless to let me know （） I am to anchor or to meet pilot．

A.which
B.where
C.what
D.who

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