【化】 标准试验的固定编号(美国材料试验协会石油产品标准试验法的编号)

fixed investment trust【金融】;non-discretionary trust【金融】

fixed splitting of second heart sound

bill drawn payable at a fixed date【金融】

bandpass filter with fixed mid-band frequency and bandwidth

bandpass filter with fixed mid-band frequency and adjustable bandwidth

fixed percentage of decreasing net value【经】

fixed pass band selector【电子】

slewing ring with fixed column【机】