液压()系统是以传递动力为主。
参考答案:传动
-Your mum is very kind.
-Yeah, My mum is pretty considerate, you know what_____ ,she always arranges everything around me.
A.she means
B.you mean
C.I mean
D.we mean
钩状效应是指用ELISA一步法测定肿瘤标志物时,标本浓度过(),实测值偏()的现象,极易造成假阴性
A.低,高
B.高,高
C.高,低
D.低,低
E.高,不变