水工建筑物的根本任务是（） ["除水害","兴水利","建水库","灌溉、发电"]
地形图的分幅方法有：（）和（）两种。
下列选项中哪一个属于我国增值税的纳税人（） ["从事房屋租赁业务的甲公司","从事皮毛加工的乙公司","转让无形资产的丙公司","从事证券经纪业务的丁公司"]
Refer to the exhibit. Analyze the two traceroutes that are displayed. Which of these statements is correct in describing what most likely caused the traceroute differences?（） [" Do not fragment has been configured on PE11."," MPLS has been disabled on routers P11 and P12."," An access list has been created on P11 to block traceroutes from PE11."," The no mpls ip propgate-ttl local command has been configured on PE11"," ICMP has been disabled on the intermediary routers between PE11 and PE12."]
（）是保护人身安全的最后一道防线。 ["个体防护","隔离","避难"]
对如何缩小或消除纺纱加捻三角区问题，要确立什么原则？
