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多播路由协议在转发多播数据报时使用的三种方法是？

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请解释VPN的概念及作用。

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[音频]Smart folks are a dime a dozen. What truly matters is creativity. As Albert put it, “Imagination is more important than 1)______”.Einstein rebelled against rote learning and that 2) helped make him the genius that he was. Likewise, our success as a nation will be 3)_not just by how well our schools teach the 4) and periodic tables but by how well they 5)_ imagination and creativity.The assertion that Einstein failed Maths as a child is, to the 6)_ of bad students, not true. But he was slow in learning to talk. That was combined with a cheeky rebelliousness towards 7)__, which led one schoolmaster to send him packing and another to amuse history by declaring that he would never amount too much.These 8)_ made Einstein the patron saint of distracted schoolchildren everywhere. But they also helped to make him the most creative scientific 9) of modern times.His cocky contempt for authority led him to question received 10)_ And as for his slow verbal development, it led him to think in pictures and to observe with wonder the everyday 11) that others took for granted.His unwillingness to yield to authority meant that he alienated all of his professors at Zurich Polytechnic. As a result, he was the only 12) in his section who was not offered a junior professorship. He struggled to find work, finally landing on a stool at the Swiss patent office in Bern as a third-class 13) . But lest we feel sorry for him, the job allowed him to do thought experiments and 14) him to question conventional wisdom, unlike the wealthy assistants in the 15) __.

防锈铝焊前母材冷作硬化程度越（），软化越（）

A. 低严重
B. 高严重
C. 高轻
D. 差严重