单选题：Karen lived for__________ since she had got out of the hosp

题目内容：

Karen lived for__________ since she had got out of the hospital． A．eleven months
B．nine months
C．twenty months
D．twelve months

参考答案：

答案解析：

I don' t think this film worth__________ again．

I don' t think this film worth__________ again． A．to see B．to be seen C．seeing

分类：英语题型：单选题

阅读下列短文，回答题。 Many people earn their living with their hands． Ed earns his livin

分类：英语题型：单选题

分类：英语题型：单选题

非正弦周期电流的有效值I用公式表示，即(　　)。A．I=I0+I1+I2+…+IN+… B．I=(I0+I1+I2+…+IN+…)1/2 C．I=(I02+I1

分类：英语题型：单选题

周期为T的非正弦信号可以分解为傅里叶级数的条件为(　　)。 A．满足狄利赫利条件 B．无条件 C．必须平均值为零 D．必须周期已知

分类：英语题型：单选题