儿童缺陷矫治率是指每千名有某种缺陷的儿童中缺陷被矫正的人数。
参考答案：错
若x2=7，则x=______．
Use your head; nothing taught by others can have the same effect on you as _________learned by yourself.
A．those
B．what
C．that
D．the one
