辊式矫直机使金属经多次反复弯曲以消除曲率的不均匀性，从而使曲率从大变小而使其平直。
参考答案：对
“人类之家”是指（ ）
A．中国
B．地球
C．陆地
D．宇宙
The majority of the local people got benefit from the medical reform which they are in ___ of.
A．honor
B．danger
C．favor
D．memory
