[单选] 吊挂和捆绑用钢丝绳的安全系数应大于等于（）。

问卷的检查 Router R1 refers to route - map fred when redistributing from EIGRP into OSPF. The entire route - map is listed next. Which of the following answers must be true based  on the configuration as shown?（） route - map fred deny 10 match ip address one route - map fred deny 20 match ip address two route - map fred permit 100 The third route map clause will allow any routes not already filtered by the first two clauses。 R outes permitted by ACL "two" will be redistributed。 Routes denied by ACL "one" will be redistributed。 All routes will be filtereD。 运行极限位置限制器由什么与限位开关组成（） 缓冲器。 安全尺。 锚定。 定距变量 说明离子键、共价键、分子键和金属键的特点。 吊挂和捆绑用钢丝绳的安全系数应大于等于（）。