属于呼吸道隔离的疾病是() ["传染性非典型性肺炎","腮腺炎","气性坏疽","伤寒","非甲非乙型肝炎"]
在爆炸性气体环境的各种电气设备的选型应符合有关规定。请根据设计规范进行下列设备选型以下()不适合在爆炸性气体危险区域为1区的场所使用。 ["A.增安型电磁阀用电磁铁","隔爆型控制开关","充油型控制开关","隔爆型按钮"]
保证责任的消灭原因不包括()。 ["保证期间届满","债权人放弃物的担保","债务人迟延履行债务","主债务消灭"]
属于严密隔离的疾病是() ["传染性非典型性肺炎","腮腺炎","气性坏疽","伤寒","非甲非乙型肝炎"]
已知函数在x0处可导,且的值是:() ["4","-4","-2","2"]
北极对全球气候变化有何重要意义?