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【简答题】
物体向不平行于基本投影面的平面投射所得的视图称为 图。
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举一反三
【简答题】小题1:He taught in this school last year.(把last year改为 since last year) He _________ _________ in this school _________ last year. 小题2:They didn’t clean the classroom yesterday.（改为被动语态） The classroom __...
【单选题】Great changes have taken place ___. [ ]
A.
in the last few year
B.
in the last few years
C.
last year
D.
on the last year
【简答题】对羟基苯甲酸酯类
【单选题】The number of players in this year's sports meet was half ______. [ ]
A.
last year's
B.
that of last year's
C.
of last year's
D.
those of last year's
【单选题】ear/year
A.
There is something wrong with this ear.
B.
There is something wrong with this year.
【单选题】The sentence 'the wheat could not be full in the ear' in the last paragraph probably means that______.
A.
the waving of the wheat could not be heard fully through the ear
B.
the wheat could not bear good fruit
C.
Wang Lung' s ear was full of the sound of wheat
D.
the wheat could not fill the ear of people
【简答题】对羟基苯甲酸酯
【简答题】对羟基苯甲酸：
【简答题】解释为什么邻一和间一羟基苯甲酸的酸性比苯甲酸大，特别是邻羟基苯甲酸酸性很强，而对-羟基苯甲酸的酸性却比苯甲酸弱?
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【单选题】ear/year
A.
There is something wrong with this ear.
B.
There is something wrong with this year.