【简答题】(理).已知a n = 1 4 n + 2 100 (n=1,2,…),则S 99 =a 1 +a 2 +…+a 99 =______.
【单选题】In the following motion, who is the agent of action? MOTION – “This house, as the central government, would pay people to settle in second-tier cities.”
【判断题】In a debate motion, ‘’This House’’ refers to everyone involved in the debate, but not the authentic House of Lords or House of Commons.
【简答题】(理)对于数列,若 lim n→∞ [(3n-1)a n ]=1,则 lim n→∞ (n a n ) =______.
【判断题】用填丝钨极氩弧焊替代不填丝的钨极氩弧焊时,可以不必再做焊接工艺评定。( )