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【单选题】
有一台三相异步交流电动机,每相绕组的额定电压为220V,对称三相电源的线电压为380V,则电动机的三相绕组应采用的联结方式是( )。A.
星形联结,有中线
B.
星形联结,无中线
C.
三角形联结
D.
A、B均可
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举一反三
【简答题】The College Entrance Examination is coming soon, many students in senior 3 think that time is limited, and they care little about their rest time. Some of them give up their noon break or even stay up...
【单选题】听力原文：Narrator Listen to part of a conversation between two students. Student A Hello, I am a new student here. Student B Hello, what can I do for you? Student A Can you tell me what the Student Union ...
A.
In a student dorm.
B.
At a Student Union office.
C.
In a classroom.
D.
At a student club.
【单选题】对功的概念有以下几种说法:
A.
守力作正功时，系统内相应的势能增加。
B.
点运动经一闭合路径，保守力对质点作的功为零。
C.
用力与反作用力大小相等、方向相反，所以两者所作功的代数和必为零。
D.
述说法中：
E.
)①、②是正确的。
F.
)②、③是正确的。
G.
)只有②是正确的。
H.
)只有③是正确的。
【简答题】What does the author say about working memory? [A] The number of stored items is limited. [B] The information contained is lasting. [C]lt stays only while you work. [D] It stores numbers quickly.
【简答题】Directions: In this part, you will hear ten short conversations between two speakers. At the end of each conversation, a question will be asked about what was said. The conversations and the questions...
【单选题】The number of members in the club ______ to two hundred.
A.
were limited
B.
limits
C.
was limited
D.
limited
【单选题】The legal speed __________ with in the city is 35 miles per hour. [ ]
A.
limitation
B.
limit
C.
limitations
D.
limited
【简答题】Directions: In this part, you will hear ten short conversations between two speakers. At the end of each conversation, a question will be asked about what was said. The conversations and the questions...
【多选题】现场应急计划中公共关系代表职责是
A.
得到通知后在规定的时间内到达应急指挥中心
B.
证实媒体对现场的报道
C.
协调所有参与应急行动人员
D.
检查公共关系应急计划
E.
定期完成应急演练计划
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