题目

     Most British telephone cards are just plain green, but card collecting is becoming a popular hobby in Britain and collectors even have their own magazine, International Telephone Cards. One reason for their interest is that cards from around the world come in a wide variety of different and often very attractive designs. There are 100,000 different cards in Japan alone, and there you can put your own design onto a blank card simply by using a photograph or a business card.      The first telephone cards, produced in 1976, were Italian. Five years later the first British ca已知反应mX(g)+nY(g) qZ(g)的△H<0,m+n>q,在恒容密闭容器中反应达到平衡时,下列说法正确的是(     )A.通入稀有气体使压强增大,平衡将正向移动B.X的正反应速率是Y的逆反应速率的m/n倍C.降低温度,混合气体的平均相对分子质量变小D.若平衡时X、Y的转化率相等,说明反应开始时X、Y的物质的量之比为n:m
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