发布时间:2025-01-19 16:32:48
660米=6600分米,200米=2000分米;
6600/5=1320
2000/3=666.7
把最长边按3分米来画才能画下
6600/3=2200
比例尺是1:2200
请问4504704954120平方的rvv的电缆外径国标是多少
2025-01-19 16:32:48 2025-01-19 16:32:48瓦楞纸箱 里面135kbr47135sc47135kbr125k47125t 135t47127t47135t 这些表示什么意思
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