【简答题】二、Part B :用方框内所给的A.B.C.D.E五个句子完成以下对话. Dialogue 1 Nurse: Good morning. Dr. Li’s office. Bruce: (1) __________. I’d like to make an appointment. Nurse: (2) __________ Bruce: I have a sore throat. Nurse:...
【简答题】已知数列{a n }的通项公式为a n = n+1 2 ,n=2k-1(k∈ N * ) 2 n 2 ,n=2k(k∈ N * ) ,设b n = a 2n-1 a 2n ,S n =b 1 +b 2 +…+b n . (1)求S n ; (2)证明:当n≥6时,|S n -2|< 1 n .
【单选题】用数学归纳法证明(n+1)(n+2)…(n+n)=2 n ?1?3?5?…?(2n-1)时,从k变到k+1时,左边应增添的因式是( )
【简答题】二、Part B :用方框内所给的A.B.C.D.E五个句子完成以下对话. Dialogue 1 ( Lucas is attending a job interview. ) Interviewer : Nice to meet you.(1)_______ Lucas : Lucas, Lucas Smith. Interviewer : OK, Mr. Smith. (2)_______ L...
【单选题】定义数据类型是无符号字符型,应该是( )。
【单选题】下面数据类型为无符号字符型变量的是( )