（固）定长（度）块

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 adjustable bandwidth

aircraft rotor blade fixed in flight to act as lifting surface

fixed percentage of decreasing net value【经】

fixed pass band selector【电子】

coefficient of renovation of fixed assets【计划】