发布时间:2025-02-01 01:52:44
已知1176*a是自然数b的平方数,则a=(71 )b=(284 )
1176=4×4×71;
厂房设备总的100个千瓦用380的电三相四线从配电箱到远的设备有100米要用多少平方的电线
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