12CrMOV进行氩弧焊,采用()焊丝。 ["A、H08CrMOv","B、TIG--R40","C、热317","D、TIG--R31"]
燃料应成型堆放,不同品种的煤可以堆放在一起。()
绘画要墨法分明,提出墨法有浓墨、淡墨、泼墨、积墨、焦墨等七种墨法的是() ["黄宾虹","潘天寿","徐悲鸿","张大千"]
明代董其昌等提出山水画的南北宗论。北宗宗主是() ["王维","李思训","关仝","荆浩"]
X20CrMOV121(F12)属()耐热钢 ["A、珠光体","B、马氏体","C、铁素体","D、奥氏体"]
捞渣机检修的隔离措施?