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【简答题】
A.取供试品0.1g,加水与0.4%氢氧化钠溶液各3ml,加硫酸铜试液1滴,生成草绿色沉淀 B.取供试品适量,加水溶解后,加溴化氰试液和苯胺溶液渐显黄色 C.取供试品10mg,加水1ml溶解后,加硝酸5滴,即显红色;渐变淡黄色 D.取供试品适量,加硫酸溶解后,在365nm的紫外光下显黄绿色荧光 E.取供试品,加香草醛试液,生成黄色结晶,结晶的熔点为228~231℃ 以下药物的鉴别反应是 盐酸氯丙嗪 A. B. C. D. E.
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举一反三
【单选题】单个原子所具有的能量的特点是
A.
能量只能取一些分立的值
B.
能量可以任意取值
C.
能量的大小主要由电子的角动量确定
D.
能量取值不受外加电场或磁场的影响
【单选题】Oh! It's you! I never____meeting here. [     ]
A.
dreamed of we
B.
dreamed our
C.
dreamed of our
D.
dreamed that we
【单选题】听力原文:W: Do you believe that Jack came out of the accident alive? M: It's surprising. The car crashed into the wall and was completely damaged. Q: What do we learn from the conversation? (16)
A.
Jack survived the accident.
B.
Jack saved all the other passengers.
C.
Jack had little damage done to his car.
D.
Jack was the only victim of the accident.
【单选题】—You play _____ violin well. —_____. [     ]
A.
/; You are kind
B.
the; Thank you
C.
/; It's kind of you to say that
D.
the; Don't say like that
【简答题】完形填空。 Before you go to another country, it's a great help if you know the language and some of the ___ 1 ___ of the country. When people meet___ 2 ___ for the first time in Britain, they say 'How do y...
【单选题】单个原子所具有的能量的特点是
A.
能量可以任意取值
B.
能量只能取一些分立的值
C.
能量的大小主要由电子的角动量确定
D.
能量取值不受外加电场或磁场的影响
【单选题】—Mom,  I'm tired of working in this company. I want _____ job. —I don't agree with you. It's not easy to get a job like this. [     ]
A.
one
B.
a
C.
an
D.
another
【单选题】单个原子所具有的能量的特点是
A.
能量可以取任意值
B.
能量只能取一些分立的值
C.
能量的大小主要由电子的角动量决定
D.
能量取值不受外加电场或磁场的影响
【单选题】It's really unwise of you ______ him the news yesterday so that it has been disturbing him all the time.
A.
having told
B.
to tell
C.
telling
D.
to have told
【多选题】义务教育的特征包括( )
A.
强制性
B.
普及性
C.
免费性
D.
地方性
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