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【简答题】
My family took a trip to New York City last summer. We were very excited. It was our first trip to New York. We 1 to New York on Sunday morning. The weather was sunny. The trip on the plane was very fine. We arrived at about 3:00 p.m. We stayed there for one 2 . We didn’t have much 3 time during our visit to New York. We were busy. On Monday, we visited the science museum. The next day, we 4 the train to Long Beach. It was interesting and we had a 5 time. However (然而), one day was really exciting for 6 . On Friday, we wanted to go to Central Park. 7 , we took a subway into the city. Later on, we took a bus to Central Park. There were many people on the bus. After ten minutes, we got off (下车) the bus at the park. But we found Maria wasn’t with us. She was 8 ! She didn’t get off. My father 9 the bus. At last, the driver stopped the bus and Maria got off. She was very careful on the buses and trains after that. We came back to Los Angeles the next day. We got home late Saturday evening. We were 10 , but we were happy. We had a wonderful time in New York. However, Maria is never going to forget her scary bus trip. 小题1: A.walked B.flew C.got D.moved 小题2: A.day B.week C.month D.year 小题3: A.free B.busy C.interesting D.good 小题4: A.bought B.saw C.took D.drove 小题5: A.quiet B.boring C.happy D.sad 小题6: A.me B.Maria C.my mother D.my father 小题7: A.First B.At last C.Then D.After that 小题8: A.in the street B.on the train C.at the park D.on the bus 小题9: A.ran after B.looked after C.looked for D.waited for 小题10: A.excited B.scared C.surprised D.tired
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【判断题】三相异步电动机空载运行时,转子侧不存在漏磁通,功率因数很低。( )
A.
正确
B.
错误
【判断题】白及的种苗繁殖 白及种子呈橄榄型,黄色粉末状,很细小(每个果荚10~30万粒种子),无胚乳,在自然状态下极少萌发成苗。因此,目前,白及种苗繁育主要采用三种方式:组培育苗,大棚直播育苗,鳞茎无性繁殖。
A.
正确
B.
错误
【判断题】在汽车CAN-BUS系统中所有节点的控制单元都是对等的。
A.
正确
B.
错误
【判断题】在CAN系统中,所有控制单元都可以接收数据总线上的数据。
A.
正确
B.
错误
【单选题】在CAN总线中()
A.
所有的信息传递都通过两条数据线
B.
每个控制单元的信息都需要一根独立的数据线
C.
两组CAN系统互为独立,不联系
【简答题】三相异步电动机空载运行时定子电路的功率因数很低,只有(),因此电动机不宜长时间空载运行。
【判断题】三相异步机空载运行时功率数很低。
A.
正确
B.
错误
【单选题】CAN系统的所有控制单元都( )在CAN数据总线上
A.
并联
B.
串联
C.
混联
D.
交叉相联
【判断题】三相异步电动机空载运行时,转子侧不存在漏磁通,功率因数很低。( )
A.
正确
B.
错误
【判断题】三相异步电动机空载运行时,转子边功率因数 cos F 2 很高,定子边功率因数 cos F 1 却很低。
A.
正确
B.
错误
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