采用反变形法可增加焊缝的（）。
A.拘束度
B.自由度
C.刚度
D.硬度
参考答案：B
__________! Let’s go there and have a look at it.
A．How beautiful picture
B．How a beautiful picture
C．What beautiful picture
D．What a beautiful picture
胸痹如何辨证论治
