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【判断题】
3(判断题)海关检查主要是检查入出境旅客是否携带有违禁品和超限额物品。 ( )
A.
正确
B.
错误
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【简答题】三相异步电动机的电气制动方法有三种,分别是()制动()制动()制动
【简答题】三相异步电动机的电气制动方法有 、 和 三种。
【单选题】动力配电箱的代号是( )。
A.
AL
B.
AP
C.
AC
D.
AE
【多选题】三相异步电动机的电气制动方法有( )。
A.
机械制动
B.
反接制动
C.
能耗制动
D.
发电反馈制动
【简答题】7)三相异步电动机的电气制动方法有 制动、 制动、 制动。
【单选题】While having orbited the sun, the satellite has sent more than four billion bits of information back to earth.
A.
orbiting
B.
to orbit
C.
being orbited
D.
having been orbited
【判断题】动物尸体、病理组织,经消毒液浸泡装入密封垃圾袋中,通过专用垃圾转移通道移 至低温冰柜中冻存,定期再请专门机构收集,统一无害化焚烧处理;
A.
正确
B.
错误
【简答题】For more _____________, please feel free to contact us. (inform)
【单选题】Which one is more formal?
A.
This is to inform. you that your book has been rejected by our publishing company as it was not up to the required standard. In case you would like us to reconsider it, we would suggest that you go over it and make some necessary changes.
B.
You know that book I wrote? Well, the publishing company rejected it. They thought it was awful. But hey, I did the best I could, and I think it was great. I?m not gonna redo it the way they said I should.
【简答题】在新农村建设中,为将一批建材运到10 m高的施工处,工人利用如图所示的滑轮组提升建材。装置中动滑轮重100N,工人每次匀速提升一箱重400N的建材,不计绳重和摩擦。试问: (1)每次提升建材时的有用功、额外功各是多少? (2)该滑轮组的机械效率是多少? (3)为加快施工进度,张师傅建议用电动机做动力替代人提升建材。为了安全,改装后每次可吊起四箱建材,建材匀速上升时的速度为0.4m/s。仓库中现有两...
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