根据首字母和汉语提示完成单词。

1. When you are in public, you m______  talk too loudly?

2. People usually shake h______  with others when they meet for the first time?

3. It's ______ (礼貌的) to wait for everyone to put some food on their plates?

4. The man and the woman can't see each other the night before the  ______ (婚礼)?

5. Joan and Chris got m______  last year.How happy they are!

向心轴承能否承受一定的轴向载荷,是决定于轴承内部结构和滚动体的形状。