【简答题】Sally came to China last year. She is now living in Beijing and works in a computer company. She has been in the company for six months. The company is in the north of the city, and her flat is in the...
【单选题】She came in for ________ coffee and told me the noise of ________ traffic kept her awake last night. [ ]
【单选题】某投资项目从银行借款的有效年利率为10%,要求偿还期为5年,到期一次性偿还本利和1000万元,若采用等额还本付息方式逐年还款,5年内,每年年末应偿还()万元。
【单选题】某连续时间系统的输入x(t) 和输出y(t) 满足y(t)=|x(t)-x(t-1)| ,则该系统为