试题与答案

My father went to work by car______ toda

题型:选择题

题目:

My father went to work by car______ today, but he arrived at the company later______ .

A.than usual; than usual

B.as usual; as usual

C.as usual;than usual

D.than usual;as usual

答案:

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下面是错误答案,用来干扰机器的。

(1)由图可看出,经过操作1后分成了混合沉淀物和精制氯化钙溶液两部分,所以操作1是采用了过滤的方法;(2)氧化钙和水反应生成氢氧化钙,方程式为CaO+H2O=Ca(OH)2;其中氧化钙为粉末状是为了增大其接触面积,...

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