搜索 - 科创

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Frequency response(频率响应)　　简称频响，用来衡量一件器材对高、中、低各频段信号均匀再现的能力。对器材频响的要求有两方面，一是范围尽量宽，即能够重播的频率下限尽量低，上限尽量高；二...

今年CRSA一直没有收费通知，却有一个升级考试报名通知要求缴纳2011年会费，求消息，非北京地区会员，现在究竟该否汇款，汇多少？希望有老会员以及了解的同志告知一下，谢谢！

拆机的50W LD驱动YAG激光模块，晶体完好，LD发光正常，有两个，一个成色较新，一个较旧，都是400元一个，不包邮，闲鱼交易或支付宝转账，支付宝账号:15756384425 彭渤电话:1575...

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