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【多选题】
醌类化合物的理化性质为( )A.
无色结晶
B.
多为有色固体
C.
游离醌类多有升华性
D.
小分子苯醌和萘醌类具挥发性
E.
游离蒽醌能溶于醇、苯等有机溶剂，难溶于水
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反馈参考答案：
举一反三
【单选题】Which two statements about packages are true?
A.
Packages can be nested.
B.
You can pass parameters to packages.
C.
A package is loaded into memory each time it is invoked.
D.
The contents of packages can be shared by many applications
【简答题】遣散费(severance pay)
【单选题】听力原文：M: Hello, I have some packages here for Kelly Martino. Is this her office? W: Yes, but she's in the middle of the meeting at the conference room now. She' ll probably be back in an hour. M: Would...
A.
The delivery
B.
The meeting
C.
The signs
D.
The workload
【简答题】Christmas Eve was tomorrow. I hoped one of the packages that held a camera had already been placed under the Christmas tree. It was the only thing I wanted. I had been dropping hints to my parents. I ...
【简答题】MM440变频器由微处理器控制,并采用( )作为功率输出器件。
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