发布时间:2025-01-28 10:47:40
那是因为熄火电磁阀里面是两根线圈,一个保持线圈一个吸拉线圈,吸拉线圈不能长时间通电,所以分成两个电源1
我们现在施工的是地铁冠梁使用的是c30混凝土请问要养护多久能达到100强度
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