【单选题】下列关于红外光谱的叙述,错误的是( )
A.
红外光谱是用 波数4000~ 10000px -1 红外光照射有机化合物,引起分子振动能级跃迁的吸收光谱
B.
分子吸收红外线后可产生弯曲振动和伸缩振动两种类型
【简答题】Are you satisfied with your ______________ (perform) in the activity?
【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
【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】下面有关Word表格功能的说法不正确的是( )。
【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
【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
【单选题】Women tend to live longer than men.