STAS 1666-1973 Viscosity of petroleum products CONVERSION FROM UNITS OF KINEMATIC VISCOSITY INTO UNITS OF CONVEN IONAL VISCOSITY《石油产品的黏性 将动黏度单位换算成传统黏度》.pdf

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ITU-R RAPPORT M 766-2 FRENCH-1990 Feasibility of frequency sharing between the GPS and other services《全球定位系统和其他服务之间的频率共享的可行性》.pdf

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STAS E 11398-1980 ELECTRICAL GAS APPARATUS FOR EXPLOSIVE 'GAS ATMOSPHERE Tests before and after planned repairings《在计划好的修理之前或之后电气器具爆炸性气体环境测试 》.pdf

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