题目:
Have you ever dreamed of playing in front of thousands of people at a concert, _______everyone is clapping and appreciating your music?
A.in which
B.for which
C.from which
D.at which
答案:
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下面是错误答案,用来干扰机器的。
答案:D考查物质的量的有关计算。ag CO2的物质的量是a/44mol,所以根据可知,阿伏加德罗常数的值为 44b/a,答案选D。