卷板是用卷板机对板料进行连续三点弯曲的（）过程。
A、塑性变形
B、弹性变形
C、弹-塑性变形
参考答案：A
Political parties often differ in their views on various _____ concerning their own countries.
A．ways
B．measures
C．issues
D．patterns
治疗气逆呕吐，首选（）
A.半夏、天南星
B.竹茹、枇杷叶
C.旋覆花、白前
D.吴茱萸、生姜
E.旋覆花、代赭石
