Which two statements about a wireless repeater topology are true？（） A wireless repeater is an access point that is not connected to the wired LAN.。 The repeater feature is only available in lightweight access point topologies.。 The SSID of the root access point must be configured on the repeater access point.。 This topology requires a 10 - 15 percent overlap between a wired access point and the wireless repeater.。 This topology requires a 15 - 25 percent overlap between a wired access point and the wireless repeater.。 To avoid interference， the repeater access point must use a different channel from what the root access point uses.。
高温高压安全阀密封面堆焊，通常采用（）焊条。 507。 D547。 D517。 D502。
Which functionality is required within an IP router that is situated at the boundary of an IPv4 network and an IPv6 network to allow communication between IPv6- only and IPv4 - only nodes?（） Autoconfiguration。 Automatic 6to4 Tunnel。 Automatic 6to4 Relay。 Network Address Translator - Protocol Translator (NAT - PT)。 Intrasite Automatic T unnel Address Protocol (ISATAP)。
学习美学应注意哪些问题？
下列材料中，可用来制造发动机活塞销的有（）。 20#。 20Cr。 35#。 45#。 40Cr。
下列属于建设项目造价审计主体的是（）
