在酸性溶液中呈阳离子型,在碱性溶液中呈阴离子型,而在中性溶液中又有类似非离子型的性质的表面活性剂称为()型表面活性剂。
A、阴离子
B、阳离子
C、两性
D、非离子
参考答案:C
No worker and no engineer who it is that is for the explosion of the chemical factory.
A.know; to blame
B.would know; blamed
C.know; to be blamed
D.knows; to blame
简答产权界定的基本原则?