现在，人们通过_1、_2等，能直接观察到地球确实在围绕太阳公转。_刷题宝

题干

现在，人们通过____、____等，能直接观察到地球确实在围绕太阳公转。

上一题下一题 0.0难度选择题更新时间:2019-04-11 11:02:17

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太空望远镜,人造卫星

同类题1

完形填空

Do you like playing the piano?Now there is a 1 in Sydney called“Play Me，I’m Yours”．People can 2the piano in many places for free．In addition to(除……之外)letting people enjoy beautiful music，the programme 3 helps them communicate(交流)with each other．

People have placed thirty pianos in 4parts of the city．People can 5 the words“Play Me，I’m Yours”on each piano．People can play music6 sing songs with the pianos．Many people stop to 7 or play happily．

Now lots of people are 8 in front of computers and busy with their work all day and they have no time to enjoy 9 ．So the programme is to help them relax and make 10 friends．

同类题2

你想询问一个男孩的年龄，应该说：How old is she?

同类题3

如图，在四棱锥P﹣ABCD中，AD∥BC，∠ADC=∠PAB=90°，BC=CD=

\frac{1}{2}

AD，E为AD的中点，异面直线AP与CD所成的角为90°．

（Ⅰ）证明：△PBE是直角三角形；

（Ⅱ）若二面角P﹣CD﹣A的大小为45°，求二面角A﹣PE﹣C的余弦值．

同类题4

如今很多校园暴力事件，施暴的多数人不知道为什么要去打人，只是出于朋友的义气“帮忙”，惹下了无端的麻烦。所以，友谊的贼船该翻就得勇敢去翻。这告诫我们（）

同类题5

近似数0.610是精确到____ 位，近似数5.02万是精确到____ 位．

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