落压成形过程实质上就是放料和收料的过程。但收料易使板料失稳而（），阻碍了板料的进一步变形。
A.开裂
B.变薄
C.起皱
D.变厚
参考答案：C
Lily Sam likes popular songs, so they went to Zhou Jielun’s concert together last night.
A．Both, and
B．Either, or
C．Not only, but also
D．Neither, nor
下列可引药上行的辅料是
A．久醋
B．蜜
C．姜汁
D．酒
E．盐水
