Update readme_cn.md

zhifu gao

2023-07-03 4a47e3b3dc0a1eeec17868763f9faae7da58bb4a

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beam_size: 5
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 0.5
lm_weight: 0.7