The first step was to determine a working ratio between anticipated casualties and future needs for whole blood.
第一个步骤是确定预期伤员的数量和后续的全血需求量之间的比率。
Working ratio Cash working expenses divided by operating revenues, expressed as a percentage.
营业费用比率即现金经营费用除以营业收入，以百分比表示。
Working ratio Cash working expenses divided by operating revenues, expressed as a percentage.
营业费用比率即现金经营费用除以营业收入，以百分比表示。
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