髋关节脱位或半脱位的测量有多种方法,在股骨头骨骺出现之前用()
A.泪滴距
B.Calve线
C.Shenton线
D.Perkin方格
E.C-E角
参考答案:A, B, C
- I was late for work this morning.
- _________. You started early, didn’t you?[ ]
A. Why not?
B. So what?
C. How come?
D. Never mind.
天馈线的驻波比一般应小于()。
A1.2
B1.5
C2.0
D0.5