肌肉的平衡长度
参考答案：
肌肉被动张力为零时，肌肉所能达到的最大长度。
Only when they were told of the importance of time ________ wasting time is like wasting part of their lives．
A．those boys realized
B．those boys had realized
C．had those boys realized
D．did those boys realize
混油切割过程中不需考虑的因素（）
A.油品质量潜力
B.油品批量
C.混油罐最大进罐流量
D.回掺泵回掺流量
