测量下肢直接长度是
A．肩峰至桡骨茎突B．肩峰至肱骨外上髁C．尺骨鹰嘴至尺骨茎突D．大转子至外踝下缘E．棘踝线
参考答案：D
—What's your new classmate like? — [ ]
A. He is Tom.
B. He is tall.
C. He is eleven.
试论述钙离子在神经活动调控中的意义。
