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【单选题】
The reason why 1994 was exceptional is that __A.
it saw an unusually large number of tourists to the U.S.
B.
it witnessed a drop in the number of tourists to the U.S.
C.
tourism was hardly affected by the weakening of the U.S. dollar that year
D.
tourists came to the U.S. for sightseeing rather than for bargains that year
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【简答题】普通三角螺纹的牙形角为_____度,梯形螺纹的牙形角为_____度。
【简答题】普通三角螺纹的牙形角为 度。
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