说明: 验证码的实现 string strReturn = ""; Random rnd = new Random(unchecked((int)DateTime.Now.Ticks)); for (int i = 0; i < 4; i++) { Random rnd1 = new Random(rnd.Next() * unchecked((int)DateTime.Now.Ticks)); j1 = rnd1.Next(35); rnd = new Random(rnd.Next() *
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