在1350OMS-PKT管理的面向连接和面向不连接的以太网业务中，哪一类以太网业务含两条Ethernet Segment（） ["EPL（ETS域）","EVPL（Bridge域）","EVPL（T-MPLS域）"]
《动车组列车服务质量规范》除列车长外，其他客运乘务人员在车厢内作业时可不戴（）。 ["领带","肩章","制帽","职务牌"]
制动系统
You are about to migrate a customer network to use a VSS. Which of these statements is true about a VSS？ （） [" The VSS switch must be the root bridge for all VLANs and is automatically designated"," The VSS switch is defined in RFC 4318 as a managed object"," The PAgP+ or LACP protocols are used to maintain the operational state of the VSS devices"," A VSS interoperates with a virtual port channel"," The 802.1Q or ISL protocols are used to maintain the operational state of the VSS devices"," A VSS increases the size of the spanning-tree domai"]
锅炉急需停炉检查内部时，熄火后应（） ["开空气阀和排污阀泄水，等其自然冷却","开空气阀和排污阀泄水，向炉膛通风冷却","等气压降至0时可泄水自然冷却","等气压降为0时开空气阀，水温降至50°C左右才泄水"]
支票
