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• 物理学上保留三位有效数字是那几位?

  1年前

• 如图所示，一玻璃棱镜的横截面是等腰△abc，其中ac面是镀银的.现有一光线垂直于ab面入射，在棱镜内经过两次反射后垂直于

  1年前

• 什么事真空负压

  1年前

• 已知ZH点的坐标为X=4633.348 Y=5540.7703 ,方位角129.55352 （129°33′12.6〃）

  1年前

• I don't know why little Jack always doesn't like the present

  1年前

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• —How’s Jack doing in Britain? —I wrote an email to him last week, but _____ I have had no reply from him.

  12个月前

• 小宁和小青从教学楼一起出发去试验楼，小宁每分钟走90米，6分钟后到达，小青以60米/分的速度前进，需要几分钟才能走到？

  1年前

• We ___have hurried all the way to the airport—the flight was called off because of the foggy weather.

  1年前

• Students are always interested in finding out ________ they can go with a new teacher. [ ]

  1年前

• 已知曲面Z=4-X平方-Y平方 上点P处的切平面平行于2X+2Y+Z=1,则P点坐标为多少?

  1年前