细牙螺纹的优缺点:();(),自锁性较好,强度高;因牙细不耐磨,容易滑扣。
参考答案:螺距小,升角小
After _____ from college, we finally got the chance to take a bike trip. [ ]
A. graduating
B. graduate
C. graduated
D. to graduate
下列哪项不是血瘀证的表现
A.面色黧黑B.肌肤甲错C.局部刺痛D.唇甲青紫E.头晕目眩