混合表示法是通过对集合中某个面的平移和旋转以及点、线、面相互间的连接操作来表示空间三维实体。()
查看答案
Generally it isnt harmful to our ears, when sounds are up to______.
A. 140 decibels
B. 100 decibels
C. 80 decibels
D. 160 decibels
AotuCAD软件常用的菜单有()。
A绘图
B屏幕
C光标
D图标
According to the passage, the focus of young college students concerns about health is mainly on
A. their present health condition.
B. their future health.
C. how to take care of themselves after retirement.
D. how long they are going to live.
Whats the necessary part of a Halloween party？
A. Scary stories.
B. Fairy tales.
C. Jokes.
D. Lectures.
微信支付 
支付宝支付