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【多选题】
醌类化合物的理化性质为
A.
为五色结晶
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,能随水蒸气蒸馏
E.
游离蒽醌能溶于醇,苯等有机溶剂,难溶于水,成苷后易溶于热水和醇,难溶于苯等有机溶剂
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【简答题】根据句意和汉语意思 写出句中所缺单词。 1.He___________ (总是)reads books about football. 2.Tom gets lots of ___________(礼物) from his friends on his birthday. 3.Don't do that __ (再). 4.This is one of the biggest___________...
【单选题】电容元件的正弦交流电路中,电压有效值不变,当频率增大时,电路中电流有效值将 ( )。
A.
增大
B.
减小
C.
不变
D.
无法判断
【判断题】法语中有八个人称,其中有六个是不一样的。()
A.
正确
B.
错误
【简答题】He reads books that are closely tied his job.
【简答题】Not only that, but when he likes an author he reads every last book the man has written, as well as his letters and all the books that have been written about him.
【单选题】G036.()是指从航线上的任意点转入安全返航通道或从安全返航道转向应急迫降点或机场。
A.
安全着陆策略
B.
航线转移策略
C.
安全返航策略
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A.
正确
B.
错误
【简答题】Six Ways to Improve Reading Comprehension Help your child keep what he reads—a crucial skill, especially as he gets older and needs to gain important information from textbooks. Have him read aloud. T...
【简答题】电容元件的正弦交流电路中,电压有效值不变,频率增大时,电路中电流将 。
【判断题】公开招标就是招标单位通过新闻媒体,公开邀请承包单位来投标。
A.
正确
B.
错误
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