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【简答题】
反应速率常数仅与温度有关，与浓度、催化剂等均无关系。
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【单选题】The two friends _____ on the Internet for three hours, and they would go on till the next morning.
A.
had been chatting
B.
had chatted
C.
were chatting
D.
has been chatting
【单选题】Three friends decided to sail around the world in a small yacht(游艇). They loaded it with food and water and set off. They traveled to many beautiful places, and were having a wonderful time. Until one...
A.
many souvenirs(纪念品) with them
B.
no medical supplies with them
C.
a large crew with them
D.
many provisions(食物贮备) with them
【简答题】. 为什么说工人、农民、知识分子是建设中国特色社会主义的重要依靠力量?
【简答题】一台绕线式三相异步电动机的额定数据为：P N =75kW，n N =720r/min，λ N =2.4，E 2N =213V，I 2N =220A，定、转子均为Y接，该电机拖动位能性恒转矩负载，大小为T L =T N ，忽略传动机构转矩损耗，试求：
【单选题】Three years ________ a long time to be cut off from contact with your friends.
A.
are
B.
were
C.
is
D.
be
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