What is the purpose of configuring the router as a PPPoE client?（）
A. to provide VPN access over L2TP
B. to enable PPP session from the router to the termination device at the headend for metro Ethernet connectivity
C. for DSL connectivity and removing the need for the end - user PC to ru n the PPPoE client software
D. for connecting the router to a cable modem, which bridges the Ethernet frames from the router to the cable modem termination system
按油泵压力分：当工作压力在（）公斤/厘米为高压泵。
A. 64-100
B. 200-400
C. 大于500
在土壤封冻前，在树于南面培一月牙形土堆早春可挡风。
A. 正确
B. 错误
少无氧化加热有哪些优点？实现少无氧化加热的主要方法有哪些？简述其适用范围？
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