【单选题】Which of the following statement about Q & A session is NOT true?
A.
Q & A session is usually held immediately after the oral presentation.
B.
Q & A session only benefits questioners.
C.
Q & A session is an important part of academic presentations.
D.
Q & A session is arranged for most of the international academic conference.
【简答题】已知{ a n }是一个公差大于0的等差数列,且满足 a 3 a 6 =55, a 2 + a 7 =16. (1)求数列{ a n }的通项公式; (2)若数列{ a n }和数列{ b n }满足等式: ,求数列{ b n }的前 n 项和S n .
【简答题】简述微粒分散体系中微粒大小测定的主要方法。
【单选题】Which of the following statement about Q & A session is NOT true?
A.
Q & A session is usually held immediately after the oral presentation.
B.
Q & A session only benefits questioners.
C.
Q & A session is an integral part of academic presentations.
D.
Q & A session is arranged for most of the international academic conference.
【多选题】下列各项中,属于我国现行税法的有( )。
【简答题】已知{a n }是一个公差大于0的等差数列,且满足a 4 a 5 =55,a 3 +a 6 =16 (1)求数列{a n }的通项公式; (2)若数列{a n }和数列{b n }满足等式: a n-1 = ,a n = ( 为), 设数列{b n }的前 项和 ,c n =(a n +19)(S n +50),数列{c n }前n项和为T n , 求T n 的最小值
【单选题】动物病毒在其宿主的单层细胞培养物上所形成的聚集体称( )。
【单选题】一台工作于温度分别为327摄氏度 和27摄氏度 的高温热源与低温热源之间的卡诺热机,每经历一个循环吸热4000J,则对外做功:
【单选题】一台工作于温度分别为327摄氏度和27摄氏度的高温热源与低温热源之间的卡诺热机,每经历一次循环吸热2000J,则对外界做功( )