武术的“六合”
参考答案：
是武术运动的基本技法法则。内三合和外三合相合，称为“六合”。“外三合”是手与足合、肘与膝合、肩与胯合。
You don't have to know the name of the author to find a book. You ____find the book by the title. [ ]
A. must
B. need
C. can
D. would
带传动中的工况系数K与哪些主要因素有关？
