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本文研究的即为适用于电力部门的小型数字程控交换系统。
The small digital programmable exchange system studied in this paper is suitable for electric department.
youdao
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本文研究的即为适用于电力部门的小型数字程控交换系统。
The small digital programmable exchange system studied in this paper is suitable for electric department.
youdao