單項(xiàng)選擇題

When a wind is permanently changing the direction from which it blows, it is（）.

A.variable
B.changing
C.backing
D.veering

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單項(xiàng)選擇題

When it is advisable to remain on VHF channel 14 you should say（）.

A.stand by on VHF channel 14
B.come to VHF channel 14
C.VHF channel 14 is the best place for you to stay by
D.remain in channel 14 and do not change

單項(xiàng)選擇題

（）is the most liable to spontaneous combustion.

A.Cement
B.Chinaware
C.Fish meal
D.Steel products