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【多选题】
关于紫外光谱,下列叙述正确的是A.
官能团相同的化合物,紫外光谱完全相同
B.
两个相同的化合物,紫外光谱应完全相同
C.
紫外光谱完全相同的两个化合物,不一定是同一种物质
D.
紫外光谱不同的两个化合物,一定不是同一种物质
E.
紫外光谱不同的两个化合物,有可能是同一种物质
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【单选题】Section B Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You shoul...
A.
Every child in hospital receives some teaching.
B.
Not enough is known about hospital teaching.
C.
Hospital teaching is of poor quality.
D.
The special children's hospitals are worst off.
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