(判断题)28: 有限个无穷小量的代数和是无穷小量。 A: 对 B: 错 ...
(判断题)22: f(x)=1,g(x)=x/x是相同的函数。 A: 对 B: 错 ...
(多选题)16: 下列函数中,奇函数是( )。 A: y=x^5+sinx B: y=sinx+2cosx C: y=x^2sinx D: y=x(x-1)(x+1) ...
(单选题)10: 函数y=sin2x的周期是( )。 A: 4π B: 2π C: π D: π/2 ...
(单选题)4: 设f(x)在(a, b)内可导,则f'(x)<0是f(x)在(a, b)内为减函数的( )。 A: 充分条件 B: 必要条件 C: 充分必要条件 D: 既非充分又非必要条件 ...
(单选题)23: Jack and Jane have been married ( ) 10 years. A: for B: since C: in ...
(单选题)11: I am getting on very well ( ) the new job. A: with B: on C: in ...
(单选题)5: He has ( ) gone out. A: just B: now C: soon ...
(单选题)24: Don't let ( ) in. The doctor is operating on the patient now. A: anyone B: someone C: nobody ...
(单选题)18: Frank, ( ) is interested in computer games, came here yesterday. A: that B: whom C: who ...