皮皮学，免费搜题
登录
搜题
【单选题】
对PRS700的整流模块中的高频DC/DC变换电路，其作用为（）A.
将220V单相交流电转换成320V直流电。
B.
将交流输入电网中的杂波滤除，同时阻碍本机产生的杂音信号反馈到公共电网。
C.
将高压直流电转换成交流电，再经二次整流将高频交流电转换成适合负载使用的低压直流电。
D.
从输出端取样，经与设定标准进行比较，然后去控制逆变器，改变脉宽，达到稳定输出的目的。
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Why is it easier to understand the real communication that occurred in a meeting by viewing a video rather than reading the meeting minutes?
A.
Facial expressions convey meaning and can be seen in the video.
B.
Intonations convey meaning and can be heard in the video.
C.
The meeting minutes do not contain any record of nonverbal communication.
D.
The emphasis placed on words or phrases is missing from the meeting minutes.
E.
All of the above.
【简答题】Nowadays people are troubled by the violence that spreads throughout the media. Movies, television and video s are full of gunplay and bloodshed, and one might reasonably ask what’s wrong with a s...
【简答题】psd 为环形图像添加效果,制作出玉手镯效果。
【简答题】阅读理解。 Nowadays people are troubled by the violence that spreads throughout the media. Movies, television and video s are full of gunplay and bloodshed, and one might reasonably ask what's wrong wi...
相关题目：