湘教版九年级上册第4章锐角三角函数 综合测试卷(含答案).doc
第4章综合测试卷
一、选择题(每题3分,共18分)
1.如图,在△ABC中,∠C=90°,AB=c,BC=a,AC=b,则sin A的值是( )
A. B. C. D.
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