Specific modular units including tin - lead solder being used in special professional equipment.

特殊专业设备中包含铅锡焊料的特定组合单元.

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Transducers used in professional loudspeaker systems, using tin - lead solder.

用于专业扬声器系统, 含有铅锡焊料的变换器.

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Tin - lead solder in the manufacture of professional audio equipment.

用于制造专业音响设备的铅锡焊料.

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