外分光光度计(按分光器将红外分光光度计分为四代): 以人工晶体棱镜作为色散元件的第一代; 以光栅作为分光元件的第二代; 以干涉仪为分光器的傅里叶变换红外光度计是第三代; 用可调激光光源的第四代仪器。
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The evidence is inarguable that Australia is becoming too expensive and too uncompetitive to do export-oriented business. Africans want to work, and its workers are willing to work for less than $2 per day. Such statistics make me worry for this country's future. We are becoming a high-cost and high-risk nation for investment.