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【判断题】
仪器分析方法的灵敏度和准确度都要比化学分析法高很多A.
正确
B.
错误
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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
【简答题】She brought with her three friends, none of I had ever met before. A. them B.who C. whom D.th...
【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?
【单选题】By 2020, scientists _____ a cure for canner.
A.
had found
B.
will have found
C.
are finding
D.
have been finding
【简答题】一台三相异步电动机，额定数据如下：U N =380V，f N =50Hz，P N =7.5kW，n N =962r/min，定子绕组为△接法，2p=6，cosψ N =0.827，p Cu1 =470W，p Fe =234W，p mech =45W，p △ =80W。试求额定负载时的：
【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
【简答题】胫骨前肌•功能:踝关节足背屈、
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