问题
单项选择题
既易氧化，又易发生异构化
A．氯霉素
B．吗啡
C．维生素C
D．肾上腺素
E．氨苄西林
答案
参考答案：D
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既易氧化，又易发生异构化
A．氯霉素
B．吗啡
C．维生素C
D．肾上腺素
E．氨苄西林
参考答案：D
| 读下面一段短文，根据上下文意思用方框内所给词或短语填空；选项中有一个多余选项。 | |
he _________ (2) the elevator, it broke and he was trapped (受困的). The man tried to __________ (3) for help, but it was a holiday so no one was in the building. He ___________ (4) staying in the elevator for more than sixty hour __________ (5) any food or water. |