Fourtou富尔图fournum.四Fourier Transform Infrared Spectrum傅里叶变换红外光谱four thousand seven hundred and six(=4706) 四千七百零六four - property - relationships四性关系four thousand one hundred and eight(=4108) 四千一百零八four thousand seven hundred and two(=4702) 四千七百零二four thousand four hundred and four(=4404) 四千四百零四four-dimension parabolic equation抛物型方程four thousand six hundred and sixty(=4660) 四千六百六十Fourier transform infrared detector傅里叶变换红外检测器four corner tangential fired boiler四角切向燃烧锅炉