采用肌间沟做臂丛神经阻滞时，最常见阻滞不全的是（）
A.桡神经
B.正中神经
C.尺神经
D.正中神经和桡神经
E.桡神经和尺神经
参考答案：C
— I have some big news for you. You've been accepted as a member of our club.
— _____ That's great! [ ]
A. Have I?
B. Pardon?
C. Congratulations!
D. Good idea!
同一块钢板在横断面及纵截面上各部位厚度不等称为（）。
A．公差
B．尺寸超差
C．不平度
D．同板差
