【单选题】科学儿童心埋学建立的标志是 ( )。
A.
达尔文于1876年写成《一个婴儿的传略》一书
B.
冯特于1879年在德国菜比锡成立心理学实验室
【单选题】具有一定肾毒性的β一内酰胺类抗生素是( )
【判断题】螺纹的旋向一般都采用左旋,只有在特殊需要情况下才选用右旋。
【单选题】The man who hit 9 people in a row had drunk so much that his mind could no longer ________ between fantasy and reality. [ ]
【单选题】Which one of the following statement is NOT true about transition state theory?
A.
Transition state theory describes a hypothetical "transition state" that occurs in the space between the reactants and the products in a chemical reaction.
B.
The species that is formed during the transition state is known as the activated complex.
C.
The activated complex exists in a very long time because it has a great store of energy.
D.
The activated complex can either be converted into products, or it can “revert” back to reactants.
【判断题】螺纹的旋向一般都采用左旋,只有在特殊需要情况下采选用右旋。( )
【简答题】( ) conformation is the preferred transition state geometry for the E2 elimination