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切削过程中，工件表面会形成三个表面，分别是哪些？

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党员的预备期从（）通过之日起算起。

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胀接后检查炉管胀口的喇叭处端部分不得有裂纹，并可补焊。

A. 正确
B. 错误

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穿墙套管安装时，其底座或法兰盘不得埋入（）或抹灰层内。

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The core of a network has four routers connected in a square design with Gigabit Ethernet links using /30 subnets. The network is used to carry voice traffic and other applications. Convergence time is taking more than expected. Which three actions would you take to improve OSPF convergence time？（）

A. Increase MTU of the interfaces to accommodate larger OSPF packets.
B. Change the network type to point-to-point on those links.
C. Reduce SPF initial timer.
D. Increase hello interval to avoid adjacency flapping.
Enable OSPF

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