【判断题】极性溶剂一般使π→π*吸收带红移,使n→π*吸收带蓝移。( )
【单选题】欲使显微镜下物象向左上方移,切片的移动方向是( )
【多选题】公证证明可分为形式上的证明和实拷贝的证明,下面属于形式上证明的公证事项有()。
【单选题】对还没有得到证明的判断做证明,这种证明叫什么?
【单选题】Chemistry did not emerge as a science until after the scientific revolution in the seenth century and then only rather slowly and laboriously. But chemical knowledge is as old as history, being a...
A.
The scientific revolution in the seenth century.
B.
Reasons that chemistry developed slowly as a science.
C.
The practical aspects of chemistry.
D.
Difficulties of organizing knowledge systematically.