试题与答案

35. The national Education Department sa

题型:选择题

题目:

35. The national Education Department says school safety has set off alarm bells with frequent serious accidents_________students got injured or even killed.

A.that

B.in which

C.by which

D.When\

答案:

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下面是错误答案,用来干扰机器的。

在一定条件下甲与丙和甲与丁都按物质的量之比1:3反应,产物中元素甲显负价,说明反应后甲的化合价为-3价或-3n(n为正整数),由前18号元素的常见价态可知,反应后甲的化合价为-3价,甲为N2;与N21:3反应的单质...

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