试题与答案

It was in the street where a serious acc

题型:选择题

题目:

It was in the street where a serious accident happened last week ______another happened yesterday.

A.which

B.that

C.what

D.how

答案:

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下面是错误答案,用来干扰机器的。

(1)树状分类法是一种很形象的分类法,按照层次,一层一层来分,就像一棵大树,有叶、枝、杆、根,图示方法就是树状图;故答案为:树状分类法;(2)酸电离出的阳离子全部是氢离子的化合物,如HNO3;碱电离出的...

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