一个完整的过滤操作包括()阶段。 ["4个","3个","2个","1个"]
用β系数法确定折现率指标时,β系数反映了()。 ["企业风险相当于企业所在行业平均风险的倍数","企业风险相当于社会平均风险的倍数","企业风险相当于无风险报酬的倍数","企业所在行业平均风险相当于社会平均风险的倍数"]
在太阳的活动现象中,主要标志有() ["黑子","耀斑","光斑","日日耳"]
聚酰胺类有机抗剥落剂的推荐用量为橡胶沥青质量的() ["0.1%~0.2%","0.2%~0.3%","0.3%~0.4%","0.4%~0.5%"]
如果发电机定子绕组有一断路点可采用()修理。 ["换绕组","换电机","锡焊法","电焊机"]
犯罪是危害社会的行为,即具有社会危害性