方框架零件因中空、刚性差，加工时易变形.
参考答案：对
A．E=，m=0
B．E=，m=
C．E=，m=0
D．E=，m=
I have no idea ______ the journalist could have got his information from.
A．that
B．why
C．why
D．where
，m=0
，m=
，m=0
，m=