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【单选题】
According to the passage，the author of the article may agree to which of the following statements? 查看材料A.
It is appropriate to send your invitation cards three or four days before a dinner party date in U．S．A．
B.
It may be appropriate to send your invitation to your guests three or four days before a dinner party date in some cultures．
C.
It is best for one to make telephone calls at night because it costs much less．
D.
If one is less than 5 minutes late，he has to make a short apology．
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【简答题】如何解释通常情况下厚度7m的煤层(f<1)采用一次采全高综采支架工作阻力比综放开采工作面支架阻力要大?
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