它降低了X线剂量指数，提高了球管效率。
大学的时候，他会定期玩一把触身式橄榄球，隔三岔五去滑雪或是骑自行车，那时他的体重指数一直控制得很好。
Back in university, when the body played a regular game of touch football and skied or cycled every other day, his body mass index (BMI) was well under control.
根据种子园亲本数目与雌、雄球花产量的关系，建立数学模型，提出了一种评价种子园各亲本配子贡献的数量方法——平衡指数法。
The mathematical model is established on the basis of the relation between the number and the production of male and female flowers of parents in seed orchard.
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