问题 单项选择题

晶闸管调速系统中,PI调节器中的电容元件发生短路就会出现()

A、调速性能下降

B、超速运行

C、无法调速

D、低速运行

答案

参考答案:A

填空题
写作题

读图并请根据你对这幅图片的理解,结合写作要求用英语写一篇词数不少于120词的短文。

写作要求:

1.简要描述图片(如:内容、寓意);

2.帮助他人的原因、好处:

3.你自己将如何帮助他人。

注意:

可参照图片里的文字以及文章的开头提示

做必要的发挥想象;

2.开头已写好,不计入总词数;

3.作文中不得提及有关考生的真实信息。

Whether to help others is an issue concerning everyone. Some people_______________________

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