中学生网络课堂本课配套习题挑战模式1/5
单选题
难度系数：
1.
如图，AC是电杆的一根拉线，测得BC=6米，∠ACB=60°，则AB的长为（ ）
| A: 12米 |
| B: 6 |
| C: 6米 |
| D: 2 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5rGC5Ye64oigQkFDPTMwwrDvvIzku47ogIzliKnnlKjlkKszMMKw6KeS55qE55u06KeS5LiJ6KeS5b2i55qE5oCn6LSo5rGC5Ye6QUPvvIzliKnnlKjli77ogqHlrprnkIblj6/lvpflh7pBQu+8jjwvcD4=
- 答案：Qg==
PHA+6Kej77ya4oi14oigQUNCPTYwwrDvvIw8YnI+4oi04oigQkFDPTMwwrDvvIw8YnI+4oi0QUM9MkJDPTEy57Gz77yMPGJyPuaVhUFCPTxpbWcgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC9CNy9DNC9yQkFDRTFWMVAxM0NQU1k1QUFBQ1o3MW42ajAyMjIucG5nIiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0I3L0M0L3JCQUNFMVYxUDEzQ1BTWTVBQUFDWjcxbjZqMDIyMi5wbmciIGhlaWdodD0iMjEiIHdpZHRoPSIxMDQiPuexs++8jjxicj7mlYXpgIlC77yOPGJyPjwvcD4=
本课配套习题挑战模式2/5
单选题
难度系数：
2.如图，要测量B点到河岸AD的距离，在A点测得∠BAD=30°，在C点测得∠BCD=60°，又测得AC=100米，则B点到河岸AD的距离为（ ）
| A: 25 |
B: 25 |
C:  |
| D: 25+25 |
一次做对，真牛！
+5奖励规则>
- 提示1：6L+H54K5QuS9nEJF4oqlQUTkuo5F77yM6K6+QkQ9eO+8jOWImeWPr+S7peihqOekuuWHukNF77yMQUXnmoTplb/vvIzlho3moLnmja7lt7Lnn6XliJfmlrnnqIvku47ogIzlj6/msYLlvpdCROeahOmVv++8jg==
- 答案：Qg==
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
本课配套习题挑战模式3/5
单选题
难度系数：
3.如图，将宽为1cm的纸条沿BC折叠，使∠CAB=45°，则折叠后重叠部分的面积为（ ）
A:  |
B:  |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：55Sx6aKY5Y+v55+l4pazQUJD5piv5LiA5Liq6aG26KeS5Li6NDXCsOeahOetieiFsOS4ieinkuW9ou+8jOWNs+KIoEE9NDXCsO+8jEFDPUFC77yM6L+HQ+S9nENE4oqlQULvvIzlnoLotrPkuLpE77yM5qC55o2u5LiJ6KeS5Ye95pWw5a6a5LmJ5rGC5Ye6QUPvvIxBQu+8jOeEtuWQjuWwseWPr+S7peaxguWHuuKWs0FCQ+mdouenr++8jg==
- 答案：RA==
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
本课配套习题挑战模式4/5
单选题
难度系数：
4.如图，山顶一铁塔AB在阳光下的投影CD的长为6米，此时太阳光与地面的夹角∠ACD=60°，则铁塔AB的高为（ ）
| A: 3米 |
B: 6 |
| C: 3 |
| D: 2 |
一次做对，真牛！
+5奖励规则>
- 提示1：5L6d5o2u5bmz6KGM5LqO5LiJ6KeS5b2i5LiA6L6555qE55u057q/5oiq5YW25LuW5Lik6L655omA5b6X55qE57q/5q615a+55bqU5oiQ5q+U5L6L5Y+KNjDCsOeahOato+WIh+WAvOiBlOeri+axguino++8jg==
- 答案：Qg==
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
本课配套习题挑战模式5/5
单选题
难度系数：
5.工地上有甲、乙二块铁板，铁板甲形状为等腰三角形，顶角为α，且tanα=
，腰长为6cm；铁板乙形状为等腰梯形，两底边长分别为4cm、10cm，且有一内角为60°．现在我们把它们任意翻转，分别试图从一个直径为5.3cm的铜环中穿过，结果是( )
，腰长为6cm；铁板乙形状为等腰梯形，两底边长分别为4cm、10cm，且有一内角为60°．现在我们把它们任意翻转，分别试图从一个直径为5.3cm的铜环中穿过，结果是( ) | A: 甲板能穿过，乙板不能穿过 |
| B: 甲板不能穿过，乙板能穿过 |
| C: 甲、乙两板都能穿过 |
| D: 甲、乙两板都不能穿过 |
一次做对，真牛！
+5奖励规则>
- 提示1：5YiG5Yir5L2c562J6IWw5LiJ6KeS5b2i6IWw5LiK55qE6auY77yM55u06KeS5qKv5b2i5pac6IWw5LiK55qE6auY77yM5rGC5Zu+5b2i55qE5pyA5bCP5a695bqm77yM5bm25LiO55u05b6ENS4zY23ov5vooYzmr5TovoPljbPlj6/lvpflh7rnu5PorrrvvI4=
- 答案：Qw==
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
