Which DSL encapsulation method requires client software running on the end - user PC that is directly connected to a DSL modem?（） [" PPPoA"," PPPoE"," PPP"," L2TP"," ATM"]
努尔哈赤
英国和美国都曾经是世界的领袖国家，他们也都是世界的霸权国家，所以在后美国时代的领袖国家就必然是霸权国家。
苏联在全世界第一次举起了社会主义胜利的旗帜。
甲状腺旁素的生理作用是（） ["升高血钙","降低血钙","升高血糖","降低血糖","升高血纳"]
艺术美的基本特征是什么？
