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，数学兴趣小组的小颖想测量教学楼前的一棵树的树高，下午课外活动时她测得一根长为1m的竹竿的影长是0.8m，但当她马上测量树高时，发现树的影子不全落在地面上，有一部分影子落在教学楼的墙壁上（如图），他先测得留在墙壁上的影高为1.2m，又测得地面的影长为2.6m，请你帮她算一下，树高是（ ）
| A: 3.25m |
| B: 4.25m |
| C: 4.45m |
| D: 4.75m |
一次做对，真牛！
+5奖励规则>
- 提示1：5q2k6aKY6aaW5YWI6KaB55+l6YGT5Zyo5ZCM5LiA5pe25Yi75Lu75L2V54mp5L2T55qE6auY5LiO5YW25b2x5a2Q55qE5q+U5YC85piv55u45ZCM55qE77yM5omA5Lul56u556u/55qE6auY5LiO5YW25b2x5a2Q55qE5q+U5YC85ZKM5qCR6auY5LiO5YW25b2x5a2Q55qE5q+U5YC855u45ZCM77yM5Yip55So6L+Z5Liq57uT6K665Y+v5Lul5rGC5Ye65qCR6auY77yO
- 答案：Qw==
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
本课配套习题挑战模式2/5
单选题
难度系数：
2.如图，为测量学校旗杆的高度，小东用长为3.2m的竹竿作测量工具，移动竹竿，使竹竿顶端与旗杆顶端的影子恰好落在地面的同一点，此时，竹竿与这一点相距8m，与旗杆相距22m，则旗杆的高为（ ）m．
| A: 8.8 |
| B: 10 |
| C: 12 |
| D: 14 |
一次做对，真牛！
+5奖励规则>
- 提示1：5Yip55So55u45Ly85LiJ6KeS5b2i5a+55bqU6L655oiQ5q+U5L6L6Kej6aKY77yO
- 答案：Qw==
6Kej77ya5Zug5Li656u556u/5ZKM5peX5p2G5Z2H5Z6C55u05LqO5Zyw6Z2i77yM5omA5Lul5p6E5oiQ5Lik5Liq55u45Ly85LiJ6KeS5b2i77yMPGJyPuiLpeiuvuaXl+adhumrmHjnsbPvvIw8YnI+5YiZPGltZyB3aWR0aD0xNSBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9DNy9BNy9yQkFDRTFXYmxRX3dYTHcwQUFBQmdYS1JKamsyMzUucG5nIj7vvJ08aW1nIHdpZHRoPTI2IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzkxL0NEL3JCQUNKMVdibFFfQW1JVmlBQUFCWmZfRktzUTU2My5wbmciPu+8jDxicj7iiLR4PTEy77yOPGJyPuaVhemAiUPvvI4=
本课配套习题挑战模式3/5
单选题
难度系数：
3.如图，测得BD=120m，DC=60m，EC=50m，则河宽AB为（ ）
| A: 120m |
| B: 100m |
| C: 75m |
| D: 25m |
一次做对，真牛！
+5奖励规则>
- 提示1：5YWI6K+B5piO4pazQUJE4oi94pazRUNE77yM54S25ZCO5Yip55So55u45Ly85q+U6K6h566XQULnmoTplb/ljbPlj6/vvI4=
- 答案：Qg==
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
本课配套习题挑战模式4/5
单选题
难度系数：
4.一个钢筋三角架三边长分别为20cm，50cm，60cm，现在要做一个和它相似的钢筋三角架，而只有长为30cm和50cm的两根钢筋，要求以其中的一根为一边，从另一根上截两段（允许有余料）作为另两边，则不同的截法有（ ）
| A: 一种 |
| B: 两种 |
| C: 三种 |
| D: 四种或四种以上 |
一次做对，真牛！
+5奖励规则>
- 提示1：5qC55o2u55u45Ly85LiJ6KeS5b2i5a+55bqU6L655oiQ5q+U5L6L77yM5YiX5pa556iL5Y2z5Y+v6Kej562U77yO
- 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.如图，小明在打网球时，使球恰好能打过网，而且落在离网4米的位置上，则球拍击球的高度h为（ ）
| A: 1.6米 |
| B: 1.5米 |
| C: 2.4米 |
| D: 1.2米 |
一次做对，真牛！
+5奖励规则>
- 提示1：5qC55o2u55CD572R5ZKM5Ye755CD5pe255CD5ouN55qE5Z6C55u057q/5q615bmz6KGM5Y2zREXiiKVCQ+WPr+efpe+8jOKWs0FEReKIveKWs0FDQu+8jOagueaNruWFtuebuOS8vOavlOWNs+WPr+axguino++8jg==
- 答案：Qg==
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
