股骨及胫腓骨的内、外髁与髌骨组成的关节称（）
A.髋关节
B.膝关节
C.踝关节
D.骶髂关节
E.跗骨间关节
参考答案：B
— How about the book you are reading now?
— Excellent indeed. You can find many problems we have come across ________ in it.[ ]
A. covered
B. covering
C. are referred
D. referred
在G功能代码中，（）是端面切削循环指令
