急性乳腺炎的早期表现中,下述哪项是错误的:() ["局部胀痛","表面红、热","囊性肿块","体温升高","明显压痛"]
引起急性乳腺炎最常见的细菌是:() ["大肠杆菌","厌氧菌","溶血性链球菌","金黄色葡萄球菌","肺炎双球菌"]
纯铜的颜色是()。 ["黄色","红色","绿色","蓝色"]
乳腺增生病是佳的治疗方法是:() ["乳房单纯切除","肿块局部切除","根治性乳房切除","药物治疗","放射治疗"]
急性乳腺炎多见于() ["妊娠晚期","初产妇哺乳期","经产妇哺乳期","青春期","绝经期"]
假设学校机房有一学生机IP地址192.168.0.6,教师机IP地址为192.168.0.168,网关地址:192.168.0.1。现在该学生机上执行命令ping192.168.0.168,不能ping通,如何一步一步排除故障,请你写出可能导致故障的原因及操作步骤。