茎尖分生组织主要是指对茎尖长度不超过0.1mm的茎尖进行培养。
参考答案：对
Women ___ in some westen countries in the world.
A, look down up B. are looked down C. are being looked down D. are being looked down upon
制定医学参考值不必备下列哪项
A．选用适当的计算方法
B．选定适当的百分界值
C．确定样本足够量的正常人
D．确定指标的单侧或双侧界值．
E．算出抽样误差
