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【单选题】
对于消除反应,说法错误的是( )A.
消除反应的同时，难免存在取代反应。
B.
结构复杂的卤代烃容易发生E1反应，因为能够生成较稳定的碳正离子。
C.
强碱有利于卤代烃容易发生E2反应，因为强碱能快速消除质子，影响反应速率。
D.
消除反应总是符合扎伊采夫规则。
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举一反三
【单选题】传染病流行过程的三个基本环节是:
A.
疫源地、传播途径和易感动物
B.
病原体、动物机体和外界环境
C.
传播途径、易感畜群和传染来源
D.
传播途径、易感动物和外界环境
【单选题】构成传染病流行过程的三个基本环节是
A.
传染源、传播途径、人群易感性
B.
传染源、环境条件、营养状况
C.
病原体、传播途径、人群易感性
D.
病原体、传播途径、免疫功能
E.
传染源、季节因素、人群易感性
【单选题】传染病流行过程的三个基本环节是
A.
疫源地、传播途径和易感动物
B.
病原体、动物机体和外界环境
C.
传播途径、易感动物和传染来源
D.
传播途径、易感动物和外界环境
【单选题】传染病流行过程的三个基本环节是
A.
病原携带者、传播途径和易感人群
B.
传染源、传播途径和易感人群
C.
病原携带者、传播机制和易感人群
D.
传染源、传播机制和易感人群
【单选题】传染病流行过程的三个基本环节是
A.
疫源地、传播途径和易感动物
B.
病原体、动物机体和外界环镜
C.
传播途径、易感动物和传染来源
D.
传播途径、易感动物和外界环境
【简答题】Which is the flight to Hong Kong?
【单选题】What does the sentence: “How was Hong Kong?” mean?
A.
How was your trip to Hong Kong?
B.
How was the weather in Hong Kong?
C.
How was the food in Hong Kong?
D.
How were the people in Hong Kong?
【单选题】传染病流行过程的三个基本环节是指
A.
传染源、传播途径、病原体
B.
传染源、传播途径、易感人群
C.
传染源、易感人群、病原体
D.
易感人群、病原体、传播途径
E.
以上都不是
【单选题】The Hong Kong dollar is pegged to the U.S. dollar at a rate of 7.8 Hong Kong dollars to 1 U.S. dollar. Suppose the central bank of Hong Kong changes the exchange value to 7.3 Hong Kong dollars to 1 U....
A.
The Hong Kong dollar has been revalued by 0.5 percent.
B.
The Hong Kong dollar has been devalued by 0.5 percent.
C.
The Hong Kong dollar has been revalued by 6.4 percent.
D.
The Hong Kong dollar has been devalued by 6.2 percent.
【单选题】When did Jackie Chan's parents move to Hong Kong?A． They moved to Hong Kong a short
A.
22． When did Jackie Chan's parents move to Hong Kong? A． They moved to Hong Kong a short time after Jackie Chan was born．
B.
They moved to Hong Kong a short time before Jackie Chan was born．
C.
They moved to Hong Kong after they came back from America．
D.
They moved to Hong Kong after Jackie Chan studied in the China Drama Acade-my．
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