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【单选题】
输入直流电压，先通过功率开关管的通断把直流电压逆变为占空比可调的高频交变电压加在变压器初级绕组上，然后经过变压器变压、高频整流和滤波，输出所需直流电压的是（）开关电源A.
隔离型
B.
谐振型
C.
非隔离型
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皮皮学刷刷变学霸
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【简答题】吴伟的人物画多描绘世俗的生活场景，塑造下层人物的形象，如 旨在歌颂具有纯洁高尚品格与坚贞爱情的，并寄予无限同情。
【简答题】A．He wasn't able to produce a single book. B．He hadn't seen a change for the better. C．He wasn't able to have a rest for a whole year. D．He found his dream would never come true.
【单选题】听力原文：The medicine he took last night made him drowsy, so he wasn't able to drive while taking it. (25)
A.
He was too sleepy to take the medicine last night.
B.
He took the medicine while he was driving a car last night.
C.
He felt drowsy last night, so he didn't have to take the medicine.
D.
He could not drive the car because of the medicine he had taken last night.
【简答题】吴伟的人物画多描绘世俗的生活场景，塑造下层人物的形象，如《 》旨在歌颂具有纯洁高尚品格与坚贞爱情的，并寄予无限同情。
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