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【单选题】
交—直—交变频器主电路中的滤波电抗器的功能是( )。 A、将充电电流限制在允许范围内 B、当负载变化时使直流电压保持平稳 C、滤波全波整流后的电压波纹 D、当负载变化时使直流电流保持平稳
A.
1
B.
2
C.
3
D.
4
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【单选题】—I haven't seen Grace for a long time. —I haven't seen her, ________.
A.
other
B.
too
C.
either
D.
instead
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【单选题】听力原文：M: You must be looking forward to your trip back to Colorado. It should be fun to hike up into those mountains again. W: Well, there might not be time for that. The thing is I haven't seen my sis...
A.
She hasn't seen her sister for years.
B.
She has no time to enjoy the scene of the mountain.
C.
She is eager to go back to Colorado for the scene.
D.
She is so busy that she has no time to climb tile mountain.
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【判断题】在截面的受压区配置一定数量的钢筋对改善混凝土的延性没有作用。()
A.
正确
B.
错误
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【单选题】It’s necessary to _________all the lights before you leave the classroom.
A.
turn on
B.
turn off
C.
turn down
D.
turn up
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【简答题】A. strip off B. throw at C. throw away D. get off E. keep back F. make it G. straighten up H. take away I. with open arms J. fr...
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【单选题】(5) 函数在某点不可导,该函数所表示的曲线在相应点的切线 ( )
A.
一定不存在
B.
一定存在
C.
不一定存在
D.
存在且一定平行于 轴
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【简答题】I. Complete the sentences with the correct form of the expressions in the box. A. tore up B. log on C. go about (sth.) D. on file E. not to mention ...
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【单选题】函数在某点不可导，函数所表示的曲线在相应点的切线
A.
一定不存在
B.
不一定不存在
C.
一定存在
D.
一定平行于 y 轴
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【判断题】Your audience is looking for a human connection, not a robot spitting words at them. Thus it’s necessary to show our emotion in delivering a speech.
A.
正确
B.
错误
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【单选题】听力原文：M: Mr. Sanders has an appointment this afternoon, but I haven't seen him today. Did he call in sick? W: No, rather than come here, he went straight out to inspect the new plant before it comes on...
A.
To the factory.
B.
To see a doctor.
C.
To keep his appointment.
D.
To get some lunch.
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【单选题】—I haven't seen Grace for a long time. —I haven't seen her, ________.
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other
B.
too
C.
either
D.
instead
查看完整题目与答案
【单选题】听力原文：M: You must be looking forward to your trip back to Colorado. It should be fun to hike up into those mountains again. W: Well, there might not be time for that. The thing is I haven't seen my sis...
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She hasn't seen her sister for years.
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【判断题】在截面的受压区配置一定数量的钢筋对改善混凝土的延性没有作用。()
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【单选题】It’s necessary to _________all the lights before you leave the classroom.
A.
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turn off
C.
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D.
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查看完整题目与答案
【简答题】A. strip off B. throw at C. throw away D. get off E. keep back F. make it G. straighten up H. take away I. with open arms J. fr...
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【单选题】(5) 函数在某点不可导,该函数所表示的曲线在相应点的切线 ( )
A.
一定不存在
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一定存在
C.
不一定存在
D.
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查看完整题目与答案
【简答题】I. Complete the sentences with the correct form of the expressions in the box. A. tore up B. log on C. go about (sth.) D. on file E. not to mention ...
查看完整题目与答案
【单选题】函数在某点不可导，函数所表示的曲线在相应点的切线
A.
一定不存在
B.
不一定不存在
C.
一定存在
D.
一定平行于 y 轴
查看完整题目与答案
【判断题】Your audience is looking for a human connection, not a robot spitting words at them. Thus it’s necessary to show our emotion in delivering a speech.
A.
正确
B.
错误
查看完整题目与答案
【单选题】听力原文：M: Mr. Sanders has an appointment this afternoon, but I haven't seen him today. Did he call in sick? W: No, rather than come here, he went straight out to inspect the new plant before it comes on...
A.
To the factory.
B.
To see a doctor.
C.
To keep his appointment.
D.
To get some lunch.
查看完整题目与答案