题目内容

习近平在“领导人气候峰会”上指出，中国将（）和（）写入《中华人民共和国宪法》，纳入中国特色社会主义总体布局。中国以生态文明思想为指导，贯彻新发展理念，以（）为引领，以（）为关键，坚持走生态优先、绿色低碳的发展道路。

A. 生态文明理念
B. 生态文明建设
C. 经济社会发展全面绿色转型
D. 能源绿色低碳发展

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There are many types of power supply. Most are designed to convert high voltage AC mains electricity to a suitable low voltage supply for electronics circuits and other devices.

A. 对
B. 错

Unregulated power supplies contain three basic components: a transformer, retifier and filter capacitor. Thi type of power supply, because of its simplicity, is the least costly. The disadvantage is that the output voltage is not constant.

A. 对
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乒乓球横拍正手攻球时食指要加力，食指稍微向移动帮助压拍（）。

A. 下
B. 上
C. 中
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The filter, formed by one or more capacitors, smoothes the previous wave eliminating the alternating current(AC) component delivered by the rectifier.

A. 对
B. 错