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【判断题】
凡是 π 键电子数符合 4n+2 ( n=0 , 1 , 2 , 3....... 等整数)规则的单环化合物都具有芳香性。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【判断题】Just-in-time training means a teacher will come to you whenever you need the training.
A.
正确
B.
错误
【单选题】You are _____ to my dictionary. Whenever you need it, just tell me.
A.
welcome
B.
comparable
C.
convenient
D.
relative
【单选题】You ______ to tell him the news; It just made him sad. [ ]
A.
need not
B.
doesn't need
C.
need
D.
don't need
【单选题】_______ ,and the information you need will come out of your computer screen.
A.
Just a moment
B.
If you just wait a moment
C.
Just waiting a moment
D.
Just to wait a moment
【简答题】You don’t need to speak French to understand the Parisians. You just need to know how to make gestures. A new guide has come out by French tourism officials, which is to help foreign visitors understa...
【多选题】只适用于刚体的公理、定理有( )
A.
二力平衡公理
B.
加减平衡力系公理
C.
平行四边形法则
D.
作用力与反作用力定律
E.
力的可传性原理
F.
三力平衡汇交定理
【简答题】What you need to do is to keep things short and sweet, just the ______. A: questions B; topics C; highlights
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