救生衣进水性能:穿着者在水中漂浮1小时,服装内的进水量应小于()g。 ["200","500","380","1000"]
每周应对整个错做、安全系统检查()次,确保车辆性能符合厂家要求。 ["1","2","3","4"]
XHZL-15型逃生面罩用于现场作业呼吸保护时,适用于氧气含量和有毒气体浓度的范围是()。 ["氧气含量小于17%,毒气体浓度不超过1%","氧气含量小于15%,毒气体浓度不超过1%","氧气含量小于17%,毒气体浓度不超过1.5%","氧气含量小于15%,毒气体浓度不超过1.5%"]
简述感染控制的目的。
下列属于自动调平系统的是()。 ["液压马达","回转减速机","变幅油缸","回转小齿轮"]
手术切口感染的易感人群是?