In which of the following aspects has the event had support？A．Saving energy.B．Saving water

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

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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.

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在烟叶储存期间，影响烟叶质量变化的外在因素有:()。

A.环境温湿度

B.异味

C.虫害

D.烟叶化学成分

此题为多项选择题。请帮忙给出正确答案和分析，谢谢！

The basic American handshake______.

A．can be done with either the right hand or the left hand

B．is complicated and difficult to follow

C．is often done by people at an old age

D．can be done between old or new friends

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