美国赫伯特Hboart MaxalMig 4943铝合金焊丝价格 ¥ 146.00 ¥ 145.00 ¥ 144.00 起订数 1千克起批 500千克起批 1000千克起批 发货地 山东济南 咨询底价 产品服务 热门商品 S410 ER309L不锈 钢埋弧焊 丝 大桥牌THM-410埋弧焊不锈钢焊丝 ¥ 33.00 京雷GFR-120GM 高强钢药芯焊丝 E121T1-GM E831...
Event.create!(name: 'Rock Fest', duration: 2.days) Event.last.duration # => 2 days Event.last.duration.iso8601 # => "P2D" Event.new(duration: 'P1DT12H3S').duration # => 1 day, 12 hours, and 3 seconds Event.new(duration: &#...