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1·This paper discusses the breakeven point engineering volume, break even point unit price, profit and operating safety ratio in the contract of drilling engineering.

探讨了钻井工程承包中盈亏平衡点工程量、平衡点单价、利润及经营安全率等问题。

2·The owners profit ratio reflects the earning profit ability, operating efficiency and capital composition of the business.

权益报酬率反映了企业的盈利能力、营运能力和资本结构特征。

3·The ratio which is used to indicate a company's ability to control its variable costs refers to the ratio of operating profit to turnover in a given accounting period. It is expressed as a percentage.

用来反映公司控制其可变成本的能力，指会计帐期内当期营运利润占当期销售总额的比率，通常以百分比表示。

4·Operating benefit is a problem that all of insurance company are concerned about. The key of profit and loss for insurance business is claim ratio index.

经营效益是每个保险公司都关心的问题，保险经营盈亏的关键是赔付率指标。