单变量实验设计中,有一种设计是理想的实验方案,但其使用的实验对象、实验经费较多,一般不轻易使用,这种实验方案是?
D
暂无解析
EinsteinwontheNobelPrizein1921andenjoyedgreatfameinGermanyuntiltheriseofNazism____hewasexpelledfromGermanybecausehewasaJew.
Nowherebutintheremotestregionofthecountry____findaplacetosettledown.
-“Youfinallymadeit,didn'tyou?”
-“Yes,____yourhelp,Iwouldn'thavesucceeded.”