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望闻问切 他如何给牲畜诊断？这种独特的方式打针，怎么就治好了猪拉痢疾？他们为什么在秋收之后才覆盖地膜？为什么盖了地膜之后粮食就能增收？他怎么让上海也养出了个头大的大闸蟹？三十亩的水面怎么就养出了一百亩水面的鱼？
