NF B40-312-1989 Refractory products - Dense insulating shaped products - Determination of ultrasonic propagation vetocity in transmission《耐火产品 致密 隔热成型产品 测定超声波传输过程中的传播速度》.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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