构件在工程中的四种基本变形是拉压变形、剪切变形、（）和弯曲变形。
参考答案：扭转变形
I'm now. I have to eat vegetables.[ ]
A. heavy
B. light
C. thin
5. Schools ban students from bringing mobile phones, which are used to _________ in exams.
A．cheat
B．click
C．charge
D．Clarify
