第1题: [单项选择]下列关于院前救护任务的叙述正确的是()。 A. 生命体征不稳定的急救病人占呼救病人的70%-80% B. 呼救病人中10%-15%为慢性病病人 C. 病情紧急但无生命危险的急诊病人占呼救病人的10%-15% D. 灾害救护是院前救护的经常性任务 E. 院前救护宜先急救,后转送 参考答案:B
A. attempted to halt the whole network for train travel B. were dissatisfied with proposed rise in unemployment C. were unhappy with their working conditions D. wanted to support workers from other unions 参考答案:B
第5题: [单项选择]下列对VLAN的描述中,错误的是______。 A. 每个VLAN都是一个独立的逻辑网段 B. VLAN之间通信必须通过路由器 C. VLAN以交换式网络为基础 D. VLAN工作在OSI参考模型的网络层 参考答案:D 答案解析:[解析] VLAN(虚拟局域网)以交换网络为基础,工作在OSI参考模型第二层(数据链路层),每个VLAN都是一个独立的逻辑网段,VLAN之间要进行通信需要通过三层设备(如路由器)。
第15题: [单项选择]The use of sinking and dispersing chemical agents for removal of surface oil is(). A. the most common method B. too expensive for common use C. generally safe to sea life D. authorized only with prior approval of the governmental On-Scene Coordinator 参考答案:D