你好：我的电路如下;
输出怎么总是30V接近供电电压，
我一个电阻一个电阻的去掉，挡去掉最后去掉R1时，7脚输出降到1.2V,当我接上R1(此时只剩下R1)7脚又输出30V，很郁闷，不合乎逻辑。求指导，谢谢
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