Page 52 - Demo
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                                    52%u5b78%u9580%u767c%u5c55%u7684%u56f0%u5883%u8207%u6311%u6230%u5f9e%u6642%u9593%u8da8%u52e2%u66f4%u53ef%u4ee5%u770b%u51fa%u9019%u500b%u7814%u7a76%u65b9%u5411%u7684%u8b8a%u9077%u3002%u5716%u56db%u986f%u793a 2000 %u5e74%u521d%u570b%u4eba%u4ecd%u662f%u4ee5%u7d14%u7406%u8ad6%u70ba%u4e3b%u6d41%u7684%u5206%u6790%u65b9%u6cd5%uff0c%u4f46%u8fd1%u5e74%u4f86%u4e0b%u8dcc%u8da8%u52e2%u5f88%u660e%u986f%u3002%u9019%u8207%u570b%u5916%u7684%u8da8%u52e2%u5982Angrist et al. %uff082017%uff09%u8207 Hamermesh %uff082013%uff09%u7684%u8abf%u67e5%u4e00%u81f4%u3002%u76f8%u5c0d%u7684%uff0c%u7406%u8ad6%u8207%u6a21%u64ec%u517c%u5177%u4e4b%u5206%u6790%u8207%u7d14%u5be6%u8b49%u5206%u6790%u65b9%u6cd5%u90fd%u5728%u660e%u986f%u6210%u9577%uff0c%u5be6%u9a57%u7684%u6587%u7ae0%u96d6%u4e0d%u660e%u986f%uff0c%u4f46%u4ea6%u662f%u6b63%u7684%u6210%u9577%u3002%u82e5%u66f4%u7d30%u7dfb%u5730%u4f86%u770b%uff0c%u4ee5%u8a08%u91cf%u7d93%u6fdf%u5b78%u8b70%u984c%u70ba%u4e3b%u7684%u6587%u7ae0%u5e7e%u4e4e%u90fd%u517c%u5177%u7406%u8ad6%u8207%u6a21%u64ec%u5206%u6790%uff0c%u800c%u8ca1%u52d9%u7d93%u6fdf%u8ad6%u6587%u5247%u662f%u4ee5%u7d14%u5be6%u8b49%u65b9%u6cd5%u70ba%u4e3b%uff0c%u7d14%u7406%u8ad6%u7684%u6587%u7ae0%u5247%u591a%u5728%u8655%u7406%u6578%u7406%u7d93%u6fdf%u5b78%u8207%u500b%u9ad4%u7d93%u6fdf%u5b78%u76f8%u95dc%u8b70%u984c%u3002%u9019%u4e5f%u986f%u793a%u500b%u5225%u9818%u57df%u5c0d%u5176%u6587%u7ae0%u6240%u63a1%u7684%u7814%u7a76%u65b9%u6cd5%u6709%u4e0d%u540c%u7684%u504f%u597d%u8207%u8981%u6c42%u3002K 1%M 1%N 1% Q 0%R3%C37%OL 6% 4%J6%I3%H3%G11%F4%E7%D13%%u5716%u4e8c%uff1a%u8ad6%u6587%u6240%u5c6c%u4e4b%u9818%u57df%u5206%u5e03%u7d14%u7406%u8ad631%%u7d14%u5be6%u8b4924%%u7406%u8ad6%u8207%u6a21%u64ec40%%u5be6%u9a575%%u5716%u4e09%uff1a%u8ad6%u6587%u6240%u63a1%u7528%u7684%u7814%u7a76%u65b9%u6cd5%uff08%u5206%u5e03%uff09
                                
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