The research discovers that:(1) Whether enjoy the tax preference has the obvious influence to main camp service profit margin, property net profit rate and property ratio of debt.

研究发现：（1）是否享受税收优惠对主营业务利润率、资产净利率和资产负债率有显著影响；

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Even when I diversified into property and later into multinational businesses, I was still vigilant about maintaining a healthy debt to equity ratio, well within the margin of errors.

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