解决问题第一题怎么做

抹灰工程应分层进行，其中底层主要的作用是()。

A.与基体粘结

B.找平

C.装饰

D.保护

请帮忙给出正确答案和分析，谢谢！

In which of the following aspects has the event had support？

A．Saving energy.

B．Saving water.

C．Raising awareness about how to combat global warming.

D．Increasing people"s knowledge about saving electricity.

请帮忙给出正确答案和分析，谢谢！

在一个试验中同时研究两个或两个以上的因素，称为()。

A.单因素试验

B.双因素试验

C.多因素试验

D.多因子试验

此题为多项选择题。请帮忙给出正确答案和分析，谢谢！

Justice Departments decision to fire its eight employees has______.

A．caused heated discussion

B．proved to be an avenge to the President

C．made the President angry

D．been the result of the Republican Party"s decision

请帮忙给出正确答案和分析，谢谢！

What is the purpose of launching the AIM spacecraft？

A．To study the climate changes above Earth"s polar region.

B．To analyze the ice clouds within Earth"s polar region.

C．To analyze the climate changes within Earth"s polar region.

D．To study the ice clouds above Earth"s polar region.

请帮忙给出正确答案和分析，谢谢！