T

图7所示电路中已处于稳态，t=0时刻闭合S，求t=2ms时电容两端电压。已知：   图7第五题题图

所有的经济现象的变化都是时间t的确定性函数。（ ）

在一次移动平均法公式：中的T表示预测期与当期的间隔数。（ ）

—When your classmate can’t follow you, what will he say to you? —He will say,“                          ”

— I don’t have any change with me．Will you pay the fare for me？ —            ．

Now that she is out of job, Lucy ___ going back to school，but she hasn’t decided yet.

She’s the only child in her family, but they didn’t really ______ her.

I hadn’t seen him for years, but I ____ his voice on the telephone.

I don't know the park, but it's _____________ to be quite beautiful.

---Why don’t you go home? ---Because the work _______.