中性温度
参考答案：是指在一种适宜的环境温度下，机体耗氧量少，代谢率最低，蒸发散热量亦少，又能保持正常体温。
The boy is too young to go to school. [ ]
A. too old to go to school
B. old enough to go to school
C. such young that he can't go to school
D. so young that he can't go to school
一螺纹的标注为M24×1.5，表示该螺纹是（）螺纹，其大径为（），螺距为1.5，旋向为右。
