角不变定律
law of constancy of angle
变水头渗透试验
falling head permeability test
变水头透水试验
falling head permeability test
变水位渗透试验
falling head permeability test
变水温
variable chilled water temperature
variable water temperature
变水温调节
variable chilled water temperature adjustment
变送粉量
variable powder feed rate
变搜索扇面角
alterable search sector angle
变水头边界
variable water head boundary