[单选] 对于波纹管平衡式安全阀，其波纹管元件的有效直径应（）安全阀关闭件密封面平均直径。

客运站 Route redistribution (RR) has become an integral part of IP network design as the res ult of a growing need for disseminating certain routes across routing protocol boundaries. By default, which description is true when redistributing routes from other routing protocols into OSPF?（） Summarized routes are unacceptable。 They will appe ar in the OSPF routing table as type E2 routes。 Only routes with lower administrative distances will be imported。 All imported routes are to be automatically summarized if possible。 防卫伤 胃肠激素 亡羊而补牢，未为迟也 对于波纹管平衡式安全阀，其波纹管元件的有效直径应（）安全阀关闭件密封面平均直径。