急性毒性评价的常用参数有（）。
A.LD
B.Lim
C.Z
D.LOAEL
E.剂量－反应曲线的斜率
参考答案：E
一个三角形的两条边分别是6厘米、7厘米，那么第三条边可能是______厘米．
Though it was midnight, she found her daughter sitting at the dest, completely ________ her homework.
A．absorbing in
B．absorbed in
C．absorbing into
D．absorbed into
