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【判断题】
凡负载作星形连接,有中线时,每相负载的相电压为线电压的 3 倍。A.
正确
B.
错误
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【单选题】We shouldn't do _____ at the table through the whole day, and we need to do more _____ if we have time to keep healthy. [ ]
A.
exercise; exercises
B.
exercises; exercises
C.
exercise; exercise
D.
exercises; exercise
【简答题】写出下列化合物的结构式。(1)乙酸苄酯(2)2一环戊基乙酸(3)N，N-乙基间甲基苯甲酰胺(4)N一溴代丁二酰亚胺(5)邻苯二甲酸二乙酯(6)苯甲酰溴(7)9一十八碳烯酸(8)正丁酐(9)苯乙酸(10)5一己酮酸乙酯
【简答题】写出下列化合物的结构式，如命名有错误． 予以更正： (1)2，4-二甲基-2-戊烯 (2)3-丁烯 (3)3，3，5-三甲基-1-庚烯 (4)2-乙基-1-戊烯 (5)异丁烯 (6)3，4-二甲基-4-戊烯 (7)反-3，4-二甲基-3-己烯 (8)2-甲基-3-丙基-2-戊烯
【简答题】完形填空。 Which is the best way to learn a foreign language? We remembered that we all learned our own language when we were 1 , if we can learn a second language in the same way, it won't seem to be so 2...
【单选题】--How about buying Tim a mobile phone ? After all, he isn’t a boy any more. --I think it’s necessary, for we sometimes want to make sure if he ____ for dinner.
A.
will come
B.
comes
C.
has come
D.
would come
【单选题】If there were no examinations, we should have＿＿＿＿＿at school．
A.
the happiest time
B.
a more happier time
C.
much happiest time
D.
a much happier time
【简答题】写出下列化合物的结构式 (1) 邻苯二胺 (2) 邻甲基苯胺 (3) 对氨基苯甲酸 (4) 盐酸甲乙胺 (5) 4,4'- 二羟基偶氮苯 (6) 叔丁醇和叔丁胺 (7) 氯化甲基乙基正丙基苯基铵 ( 8 )氯化重氮苯
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