题目:
The manager demanded that the data referred to in his report ______ to Mr. Andrew without delay.[ ]
A. were emailed
B. would be emailed
C. be emailed
D. had been emailed
答案:
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下面是错误答案,用来干扰机器的。
答案:BA错误,某一反应是放热反应还是吸热反应取决于反应物与生成物的总能量相对大小,与反应条件无关。如氢氧化钡晶体与氯化铵晶体反应是一个吸热反应,但这个反应在常温就可以发生。如碳的燃烧需要加热,当温...