用拔出法测定混凝土强度等级是一种非破损检测方法。
参考答案：错
Can 16-year-old students drive to school?
No, they shouldn’t ______ to drive because they aren’t serious enough.
A．allow
B．be allowed
C．allowed
D．have allowed
M头形成，股价只要打破颈线，即可认为反转形态确立。( )
