选择题:在△ABC 中, 内角 A, B, C 的对边分别为 a, b, c, 若 b=asinC, c=acosB, 则△ABC 一定是()

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题目内容:

在△ABC 中, 内角 A, B, C 的对边分别为 a, b, c, 若 b=asinC, c=acosB, 则△ABC 一定是()

A.等腰三角形非直角三角形

B.直角三角形非等腰三角形

C.等边三角形

D.等腰直角三角形

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