问题
填空题
某人在20米高的塔顶测得地面上的一点的俯角是60°，这点到塔底部的距离约为______（精确到0.1米）．
答案
∵tan60°=垂直高度：水平距离，
∴这点到塔底部的水平距离为
=20 3
≈11.5（米）．20 3 3
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某人在20米高的塔顶测得地面上的一点的俯角是60°，这点到塔底部的距离约为______（精确到0.1米）．
∵tan60°=垂直高度：水平距离，
∴这点到塔底部的水平距离为
=20 3
≈11.5（米）．20 3 3
| 完型填空。 |
| Is He Only One Day Older than You? Joan and Alice are in Grade One. They 1 in the same building and they're good 2 .They go to school and come home together (一起). After 3 they sing, play, read or do their homework in front of the building. It's Joan's birthday today. Joan 4 Alice to her party. The little girl went there at six. The party 5 and all the people said,"Happy birthday to you, Joan!" She was very 6 . Joan's parents brought some food and the children thought it was very delicious, so they 7 much. After that they began to play in the room. They 8 a good time there. "Weren't you at home yesterday?" asked Alice. " 9 " answered the girl. "It was my grandpa's birthday and I went there with my 10 ." "What?" the little girl said in surprise (惊讶地). "Is he only one day older than you?" |
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