题目:
In the last few years thousands of films __________ all over the world. [ ]
A. have produced
B. have been produced
C. are producing
D. are being produced
答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析:标准状况下, CCl4为液态,故A错误;苯分子中不含碳碳双键,故C错误;6.4gCu与20mL10 mol·L-1浓硫酸反应,由于随着反应的进行,浓硫酸变成稀硫酸,反应停止,故铜有剩余,转移的电子数小于0.2NA,故D错误。