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【单选题】
两个化合物(1) 和(2) 如用红外光谱鉴别, 主要依据的谱带是( )A.
(1)式在~3300 cm -1 有吸收而(2)式没有
B.
(1)式和(2)式在~3300 cm -1 都有吸收,后者为双峰
C.
(1)式在~2200 cm -1 有吸收
D.
(1)式和(2)式在~2200 cm -1 都有吸收
E.
(2)式在~1680 cm -1 有吸收
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举一反三
【单选题】Both of these types of people are usually ______ their character.
A.
regretting of
B.
sensitive about
C.
proud of
D.
unaware of
【单选题】Who usually looks after the children in a both motherless and fatherless family in America?
A.
The children's aunt.
B.
The children's nursery or school.
C.
The children's grandmother.
D.
The children's neighbour.
【简答题】角度数字一律按（ ）方向书写
【简答题】实际金属晶体多为（）晶体，其理化和力学性能在不同方向上表现出（）。
【单选题】AC and DC generators are similar in that they _____.
A.
both generate alternating voltages
B.
both rectify the voltage before delivery
C.
are constructed at the same physical size for the same kilowatt rating
D.
both supply three-phase power
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