The question has been raised at the meeting _____ each member country should equally share the expense

of the committee. [ ]

A. that

B. whether

C. if

D. what

纯碱生产中，盐水精致的主要目的是（）。

A、除去钙镁离子

B、钙硫离子

C、除去镁和硫酸根离子

D、除去钙和二氧化硅