Methods A random, double blind, and placebo control study was conducted.
方法采用随机双盲、安慰剂平行对照研究。
Sheldon:How could there be a double-blind study? Who would be the control group?
怎么可能有双盲研究?谁来当认证结果?。
It has been systematized for operation control and can decrease the losing of blind operation.
该系统使得飞机人工增雨作业的指挥决策系统化，可减少盲目作业带来的损失。
DESIGN: Randomly double blind and control experiment.
设计：随机双盲对照实验。
DESIGN Randomized control experiment and single blind method.
随机对照实验，单盲法评估。
DESIGN Randomized control experiment and single blind method.
随机对照实验，单盲法评估。
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