道路运输过程中，经常导致事故的危险源主要集中在（）上。 行车环境不安全因素。 道路的不安全因素。 驾驶员的违法行为。 运输企业安全管理不善。
按水利部有关规定，在阶段验收、单位工程验收和竣工验收中，对施工质量是否满足设计要求提出评价意见的是（）。 监理单位。 设计单位。 项目法人。 施工单位。
A medium-sized company has a Class C IP address. It has two Cisco routers and one non-Cisco router. All three routers are using RIP version 1. The company network is using the block of 198.133.219.0/24. The company has decided it would be a good idea to split the network into three smaller subnets and create the option of conserving addresses with VLSM. What is the best course of action if the company wants to have 40 hosts in each of the three subnets?（） Convert all the routers to EIGRP and use 198.133.219.32/27, 198.133.219.64/27, and 198.133.219.92/27 as the new subnetworks.。 Maintain the use of RIP version 1 and use 198.133.219.32/27, 198.133.219.64/27, and 133.219.92/27 as the new subnetworks.。 Convert all the routers to EIGRP and use 198.133.219.64/26, 198.133.219.128/26, and 133.219.192/26 as the new subnetworks.。 Convert all the routers to RIP version 2 and use 198.133.219.64/26, 198.133.219.128/26, and 133.219.192/26 as the new subnetworks.。 Convert all the routers to OSPF and use 198.133.219.16/28, 198.133.219.32/28, and 198.133.219.48/28 as the new subnetworks.。 Convert all the routers to static routes and use 198.133.219.16/28, 198.133.219.32/28, and。
《铁路技术管理规程》（普速铁路部分）特殊指定的列车的等级，应在（）时确定。 任意。 指定。 固定。 统一。
火花塞是由中心电极、侧电极、外壳和（）部分组成。 碳棒。 锡片。 瓷绝缘体。 导电片。
截面螺旋箍筋柱，若按普通钢筋混凝土柱计算，其承载力为300KN，若按螺旋箍筋柱计算，其承载力为500KN，则该柱的承载力应示为（）。
