When depression economics prevails , however, this virtue becomes a vice . F . D . R.
然而,当萧条经济蔓延的时候, 这种美德就变成了罪恶.
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Three axes D . R . O . dose loop system detection ensure superior feed accuracy.
三轴光学尺闭徊路系统监视功能,确保位移摇动精度.
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D R Greatrix . Acceleration - Base Combustion Augmentation Modelling for Non - Cylindrical Grain Solid Rocket Motors ? ? R ］. AIAA 95～2876.
曹泰岳,常显奇,等. 固体火箭发动机燃烧过程理论基础[M]. 长沙:国防科技大学出版社.
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Ferranti Metrology from Scotland introduced its Cantilever CMM with D R O and Fixed Probes.
苏格兰Ferranti计量公司发明了悬臂测量机,配置数显设备和硬测头.
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