Warning: file_put_contents(): Only 0 of 6129 bytes written, possibly out of free disk space in /www/wwwroot/ppbbu/4cd.cn/index.php on line 55 control group英英字典_control group剑桥英语解释_control group柯林斯英文解释_沉淀汉英词典
1. N any group used as a control in a statistical experiment, esp a group of patients who receive either a placebo or a standard drug during an investigation of the effects of another drug on other patients 控制组