【单选题】【消耗次数:1】
—Whats one fourth and a half, do you know?—Yes, its ______.
two sixths
three fourths
one three
three sixths
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【单选题】 —He has two brothers and three sisters. Do you know____ of them?—No, I know ____ of them.
①  some; none
②  some
③  any; none
④  either; some
【单选题】 I will count three hundred and not one of you ______ move a bit.
①  is to
②  are to
③  is
④  are
【单选题】 Twelve is to three _____ four is to one..
①  in
②  like
③  as
④  what
【单选题】 Three-fourths of the homework ____ today.
①  has finished
②  has been finished
③  have finished
④  have been finished
【单选题】 There _____ a basketball match between Class One and Class Three this afternoon.
①  is going to be
②  will have
③  are going to be
④  is going to have
【单选题】 At that time, the committee, so far as I know, _______ of three scientists, two professors, and four senior engineers.
①  composed
②  comprised
③  consisted
④  made up
【判断题】 A: You know, I have three kids now. B: Thats terrific.
①  正确
②  错误
【单选题】 30. -May I borrow these three magazines? -____. You may keep them for two weeks.
①  Of course not
②  By all means
③  I’m afraid not
④  It’s up to you
【判断题】 A: Do you mind if I take three days off this week? B: Never mind.
①  正确
②  错误
【单选题】 It took us ______ less than three hours to do the work.
①  no
②  not
③  none
④  nothing
随机题目
【判断题】 幅频特性是指输入与输出信号的幅值比与频率的关系。()
①  正确
②  错误
【判断题】 磁电式传感器可以用于测量线速度和角速度。()
①  正确
②  错误
【判断题】 频率响应函数同时反映了系统响应的稳态过程和过渡过程。()
①  正确
②  错误
【单选题】 δ(t)函数的频谱是()。
①  水平直线
②  离散谱
③ 
【单选题】 周期信号的傅里叶级数三角函数展开式为式中,表示_________,表示_________,表示_________。()
①  平均值,正弦分量的幅值,余弦分量的幅值
②  平均值,余弦分量的幅值,正弦分量的幅值
③  均方值,余弦分量的幅值,正弦分量的幅值
④  均方根值,正弦分量的幅值,余弦分量的幅值
【单选题】 测试装置的频响函数H(jω)是装置动态特性在()中的描述。
①  幅值域
②  时域
③  频率域
④  复数域
【单选题】 根据理想测试系统的()性质可以推得:输出信号含有什么频率成分,输入信号中也一定含有这种频率成分。
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【单选题】 压电传感器利用了材料的()。
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【单选题】 基于非电量电测法的测试系统由()组成。
①  信号调理器、标定装置和激励装置
②  标定装置,传感器和激励装置
③  测量装置、标定装置和激励装置
④  测量装置,标定装置和记录仪
【单选题】 周期信号被矩形窗函数截断后的信号的频谱是()的。
①  连续
②  离散
③  连续或离散
④  不确定