尺神经阻滞的首选进针部位是（）
A.肱骨内上髁
B.肱骨外上髁
C.尺神经沟
D.腕部尺动脉旁
E.斜角肌间沟
参考答案：C
My father is a doctor. He _______ on Saturday or Sunday. [ ]
A. no work
B. isn't work
C. don't work
D. doesn't work
掺量≥1%的同品种外加剂每（）为一批
A.30吨
B.50吨
C.80吨
D.100吨
