问题
单项选择题
为了预防和矫正畸形，矫形器的主要作用原理是（）
A.三点力作用
B.牵引作用
C.支撑作用
D.替代作用
E.稳定作用
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
为了预防和矫正畸形，矫形器的主要作用原理是（）
A.三点力作用
B.牵引作用
C.支撑作用
D.替代作用
E.稳定作用
参考答案：A
| Thank you for your invitation to visit next week. I'm sorry, but I can't come. I have a really busy week. This evening I'm going to my cousin's birthday party. And tomorrow, I have to go to the dentist and play the piano. On Wednesday, I have tennis training with the school team. And I have to study for my English test on Thursday. On Friday evening, I'm going to the movies with some friends. | ||||||||||||||||
| 阅读短文，完成下面的日历表。 | ||||||||||||||||
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