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问题 多项选择题

超短波治疗时，治疗机不输出则会()

A．增加振荡电路上电能消耗

B．影响振荡管寿命

C．能量不充分输出，影响治疗效果

D．增加向四周空间辐射电磁波

E．环境中电磁波污染和干扰加重

答案

参考答案：A, B, C, D, E

选择题

--- He looks so tired. What’s wrong?

--- Nothing serious. He just stayed up last night, ___________his papers.

A．to prepare

B．having prepared

C．prepared

D．preparing
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选择题

Armed with the information you have gathered, you can_______ preparing your business plan.

A．set out

B．set about

C．set off

D．set up
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