临床试验中最常见的设计是平行组设计和交叉设计。
The most common designs in clinical trial are parallel design and cross over design.
方法采取平行组设计、分层随机、双盲、多中心临床试验方法。
Methods parallel group, stratified randomization, double blinded, muti-center clinical trail was designed.
方法：采用随机、双盲、安慰剂平行组对照、剂量反应研究设计和优效性检验。
METHODS: Cortex fraxini total coumarin was involved in a randomized, double-blind, placebo parallel control, dosage-reaction design and superiority test.
本文根据能量平衡和光程相等的原理，导出一组非平行入射光束的整形器面形设计公式。
Based on the principle of energy balance and equivalent optical length, a series of formulas have been derived.
本文根据能量平衡和光程相等的原理，导出一组非平行入射光束的整形器面形设计公式。
Based on the principle of energy balance and equivalent optical length, a series of formulas have been derived.
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