GCrl5SiMn钢的含铬量是:() ["A15%","B1.5%","C0.15%","D0.015%"]
焊后为消除应力,应采用()方法。 ["消氢处理","淬火","退火","正火"]
感生电流的方向永远和感生电动势的方向一致。()
为了减小涡流,电动机和电器的铁心采用涂有绝缘漆的硅钢片叠装而成。()
钢经表面淬火后将获得:() ["一定深度的马氏体","全部马氏体","下贝氏体","上贝氏体"]
辩证题:某男,28岁,做销售工作,经常有业务吃饭喝酒,生活作息不规律,烟酒量大,常有便秘,身高1米72,体重98公斤,腰围33寸,想急切的减肥。