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难熔金属
释义
难熔金属
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工学
难熔金属
释
refractory metals
难熔金属
熔点高于2400℃的钨(W)、钽(Ta)、钼(Mo)、铌(Nb)、铼(Re)等金属的总称。以难熔金属为基体,添加其他元素的合金称为难熔合金,其使用温度在1200℃以上。
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time and frequency measurement instruments
time and frequency measurements
time and frequency metrology
time and frequency primary standard
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time and frequency signal
time and frequency synchronization
time and frequency transfer
time and frequency transfer via optical fiber
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