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【单选题】
Flight spoiler can also assist in the ________ of the aircraft.A.
lateral control
B.
longitudinal control
C.
directional control
D.
ground deceleration
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【简答题】听录音，根据所听到的答语选择问句。 ( ) 1. A. When did you come to Canada? B. Where are you from? C. Who is he? ( ) 2. A. How are you? B. How old are you? C. How many people are there in your family? ( ) 3....
【简答题】制备乙酰水杨酸的方法是：在浓硫酸催化下，将水杨酸（邻羟基苯甲酸）与乙酸酐混合加热。反应毕，反应液冷却即析出产物。过滤，用水作溶剂重结晶得产品。问：产品中最有可能存在的杂质是什么？它是怎样带来的？如何检验其存在？
【单选题】When any non-human organ is transplanted into a person, the body immediately recognizes it as ______.
A.
novel
B.
foreign
C.
remote
D.
distant
【单选题】How did you come to know where she is living ?
A.
Modal auxiliary
B.
primary auxiliary
C.
semi-auxiliary
D.
notional verb
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