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"]
《动车组列车服务质量规范》列车进出站时,在车门口立岗,面向站台致注目礼,以列车进入站台开始,开出站台为止。
否认思维和存在具有同一性的哲学是()。 ["唯心主义","形而上学","不可知论","二元论"]
(跑步的)腾空距离
班级教育力量不仅有班主任,还包括( )、()此外作为班级成员的()也会发挥重要的教育影响作用。