1/5单选题
难度：
1.
在Rt△ABC中，∠C=90°，AB=5，AC=4，则sinA等于（ ）
| A |
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| B |
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| C |
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| D |
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- 提示1：
- PHA+5YWI5qC55o2u5Yu+6IKh5a6a55CG5rGC5Ye6QkPvvIzlho3moLnmja7lnKjnm7Top5LkuInop5LlvaLkuK3plJDop5LkuInop5Llh73mlbDnmoTlrprkuYnop6PnrZTvvI48L3A+
正确答案：Qg==
PHA+6Kej77ya4oi15ZyoUnTilrNBQkPkuK3vvIziiKBDPTkwwrDvvIxBQj0177yMQUM9NO+8jDxicj7iiLRCQz08aW1nIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMUMvREQvckJBQ0ZGVjFOX2p4UFVFS0FBQUI3MmFUNXpBNTkwLnBuZyIgZGF0YS1ja2Utc2F2ZWQtc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8xQy9ERC9yQkFDRkZWMU5fanhQVUVLQUFBQjcyYVQ1ekE1OTAucG5nIiBoZWlnaHQ9IjQyIiB3aWR0aD0iNjIiPj0z77yMPGJyPuKItHNpbkE9PGltZyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzgyLzBFL3JCQUNKbFYxTl9qd0JCZFJBQUFCaGl3ZUtsSTYzMS5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvODIvMEUvckJBQ0psVjFOX2p3QkJkUkFBQUJoaXdlS2xJNjMxLnBuZyIgaGVpZ2h0PSI0MiIgd2lkdGg9IjE1Ij49PGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzgyLzNEL3JCQUNKMVYxTl9pUWd3V2hBQUFCTVhOWmlFODU3OC5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvODIvM0QvckJBQ0oxVjFOX2lRZ3dXaEFBQUJNWE5aaUU4NTc4LnBuZyIgaGVpZ2h0PSI0MiIgd2lkdGg9IjciPu+8jjxicj7mlYXpgIlC77yOPGJyPjwvcD4=
2/5单选题
难度：
2.
如图，在平面直角坐标系中，P是∠1的边OA上一点，点P的坐标为（3，4），则sin∠1的值为（ ）
| A |
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| B |
|
| C |
|
| D |
|
- 提示1：
- PHA+6aaW5YWI6L+H54K5UOS9nFBC4oqleOi9tOS6jueCuULvvIzov5vogIzlvpflh7pQQj0077yMQk89M++8jOWGjeWIqeeUqOWLvuiCoeWumueQhuaxguWHuk9Q55qE6ZW/77yM6L+b6ICM5b6X5Ye6562U5qGI77yOPC9wPg==
正确答案：Qw==
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
3/5单选题
难度：
3.
如图，在2×2正方形网格中，以格点为顶点的△ABC的面积等于
，则sin∠CAB=（ ）
| A |
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| B |
|
| C |
|
| D |
|
- 提示1：
- PHA+5qC55o2u5Yu+6IKh5a6a55CG77yM5Y+v5b6XQUPjgIFBQuOAgUJD55qE6ZW/77yM5qC55o2u5LiJ6KeS5b2i55qE6Z2i56ev5YWs5byP77yM5Y+v5b6XQ0TnmoTplb/vvIzmoLnmja7mraPlvKblh73mlbDnmoTlrprkuYnvvIzlj6/lvpfnrZTmoYjvvI48L3A+
正确答案：Qg==
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
4/5单选题
难度：
4.
如果∠A为锐角，且sinA=0.6，那么( )
| A | 0°＜A≤30° |
| B | 30°＜A＜45° |
| C | 45°＜A＜60° |
| D | 60°＜A≤90° |
- 提示1：
- 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
正确答案：Qg==
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
5/5单选题
难度：
5.
如图，以O为圆心，任意长为半径画弧，与射线OM相交于点A，再以点A为圆心，AO长为半径画弧，两弧交于点B，画射线OB，则sin∠AOB的值等于（ ）
| A |
|
| B |
|
| C |
|
| D |
|
- 提示1：
- PHA+5YWI5qC55o2u6aKY5oSP5Yik5pat5Ye64pazQU9C55qE5b2i54q277yM5YaN5b6X5Ye64oigQU9C55qE5bqm5pWw77yM55Sx54m55q6K6KeS55qE5LiJ6KeS5Ye95pWw5YC85Y2z5Y+v5b6X5Ye657uT6K6677yOPC9wPg==
正确答案：Qw==
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