单项选择题
"Hero" has been certified platinum by the Recording Industry Association of America (RIAA). It means RIAA gave Mariah Carey a record made of platinum.
A.对
B.错
"Hero" has been certified platinum by the Recording Industry Association of America (RIAA). It means RIAA gave Mariah Carey a record made of platinum.
A.对
B.错
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单项选择题
下列描述SN2反应性质的说法,哪一项是错误的?
下列描述SN2反应性质的说法,哪一项是错误的?
A. 通常动力学上呈二级反应,对反应物和亲核试剂浓度各呈一级
B. 进攻试剂亲核能力对反应速率有显著影响
C. 反应物离去基离去能力对反应速率有显著影响
D. 叔卤代烃比仲卤代烃反应快