【简答题】Are you satisfied with your ______________ (perform) in the activity?
【多选题】以下叙述中,正确的是()
A.
在红外光谱中,总体来说,基频峰是强峰,泛频峰是弱峰
B.
按照量子力学理论:某基团红外吸收的基频峰是由于该基团从振动基态跃迁到第一激发态,吸收了与该能级差相等能量的红外光而产生的
C.
按照量子力学理论:某基团红外吸收的倍频峰是由于该基团从振动基态跃迁到第二或第三激发态,吸收了与对应能级差相等能量的红外光而产生的
D.
双原子分子(或基团)并非理想的谐振子,因此,真实的吸收峰频率比按谐振子计算出的频率要大
【单选题】下列叙述正确的是( )。
E.
物质由于分子的振动、转动能级的跃迁产生的吸收光谱称为荧光光谱
【单选题】Can you choose the appropriate cause for the following statement? Women tend to live longer than men owing to ___________________.
D.
poor immunity against diseases
【简答题】Women (tend) to live longer than men.
【单选题】Can you choose the appropriate cause for the following statement? Women tend to live longer than men owing to ___________________.
C.
poor immunity against diseases