锰硅合金生产中要提高合金的含硅量,需要有合适的炉渣碱度。当炉渣的碱度(CaO/SiO2)在()之间,合金含硅量高。 ["1.0-1.2","1.2-1.5","0.3-0.5","0.5-0.7"]
埋地灯具的外壳防护等级不应低于()。 ["IP37","IP47","IP57","IP67"]
患者,女,23岁。剖腹产一女婴后,小便不通,小腹胀急疼痛,倦怠乏力,少气懒言,语音低微,面色少华,舌质淡,苔薄白,脉缓弱。其证候为() ["气虚证","肾虚证","血瘀证","湿热下注证","肝经郁热证"]
下面软件中哪些不是排版软件?() ["方正飞腾","Pagemaker","PhotoShop","QuarkXpre"]
掉期交易
起始复合物