当零件所需凸缘的高度较大时，直接成形无法实现可采用先（）后翻边。
参考答案：拉伸
The discovery of new evidence led to _____. [ ]
A. the thief having caught
B. catch the thief
C. the thief being caught
D. the thief to be caught
左心室肥大的心电图诊断标准是（）
A.RV1+SV5>3.5mV（女）～4.0mV（男）
B.RV5+SV1>3.5mV（女）～4.0mV（男）
C.RV5>3.5mV
D.RV1>1.5mV
E.SV5>2.5mV
