腰麻时注药的速度一般采用（）
A.每秒注射1ml
B.每2秒注射1ml
C.每3秒注射1ml
D.每4秒注射1ml
E.每5秒注射1ml
参考答案：E
--- How often do you eat out ?
--- ____ , but usually once a week.
A．Have no idea
B．As usual
C．It depends
D．Generally speaking
