____ your mother usually go to the market in the morning?[ ]
A. Does
B. Do
C. Is
答案:A
可治疗热病、头痛、咽喉肿痛的腧穴是()
A.后溪
B.少泽
C.养老
D.列缺
E.听宫
拉线UT型楔形线夹在受力后,螺扣应外露,其长度不应小于()mm,且最大不得大于螺纹全长的1/2。
A.10
B.20
C.30
D.40