量纲分析的基本原理是（）。
A．几何相似原理
B．量纲和谐性原理
C．运动相似原理
D．动力相似原理
参考答案：B
用所给单词的适当形式填空。
1. Listen! They______(sing)in the classroom.
2. 一Where's Bill?
一He_______(take)photos over there.
3. He_______(not watch)TV now.
4. It's six o'clock in the evening. She______(eat)dinner .
5. Look! The students_________ (wait) for the school bus.
Products which are made from dirts and are ______ high temperatures are known as ceramics.
A．tempered in
B．subjected to
C．exposed to
D．baked in
