简述什么是 SPWM 及正弦波脉宽调制技术的工作原理

不属于沉桩施工工艺的是

作业:请选用折、折叠或编织表现手法,制作一个插花作品,并提交作品图片

作业二:一篇观后感或读后感,赏析也可,电影推荐《放牛班的春天》,推荐书单和电影已发至课程资料中。感想、赏析以文档或照片形式上传。（）

阅读短文，判断正（） 4. Amy wasn’t tired. Because she was happy.

计算机网络根据覆盖范围,可划分为____、____和____,其中____主要用来构造一个单位的内部网

小明近日自觉口渴、皮肤干燥并伴有大便干燥等症状,可用 汤治疗

You’ve done much of the work,nd plese leve ______ to us.the restB．the otherC．notherD．the othYou’ve done much of the work,nd plese leve ______ to us.the rest B．the other C．nother D．the others

We have been friends and ________ for more than 20 years. （）

We would like to see closer ________ between parents and schools. （）

I took the _______ to her office on the fourteenth floor. （）