Is this the reason ______he explained at_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

Is this the reason ______he explained at the meeting for his carelessness in his work?

A．that

B．what

C．how

D．why

答案

答案：A

单项选择题

若只经过钠树脂(RNa)处理的水，其出水( )。

A．碱度不变，碳酸盐硬度不变

B．碱度不变，硬度降低

C．碱度降低，碳酸盐硬度降低

D．碱度降低，硬度降低

单项选择题

子弹的基本结构制式子弹由弹头、弹壳、底火和（）组成。

A.火药

B.弹药

C.发射药

D.烟火药