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The term “quartz accurate” has become a familiar phrase used to describe the accuracy of many tim

2024-01-30 7 准ZVS

EN71-4:1998 标准 Safety of toys —Part 4: Experimental sets for chemistry and related activi

2024-02-29 1 准ZVS

LCD检验标准:一﹑作业內容             

2024-03-15 6 准ZVS

以下为USB测试标准，参考标准为USB Specification Revision 2.0USB　Electrical,Mechanical,and Environmental Com

2024-03-26 2 准ZVS

本标准针对交流输入、具有稳定直流输出的LED路灯驱动电源，对其性能及技术指标制订了详细而 严格的规定，规范了LED路灯电源的功率规格及命名方式

2024-04-02 3 准ZVS

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2024-04-24 4 准ZVS

BS EN71-9:2005 标准Safety of toys —Part 9: Organic chemical compounds —Requirements

2024-05-16 2 准ZVS