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【单选题】
需求曲线斜率为正的充要条件是( )。A.
低档商品
B.
低档商品且收入效应超过替代效应
C.
收入效应超过替代效应
D.
替代效应超过收入效应
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反馈参考答案：
举一反三
【判断题】齿轮采用低碳钢时:工艺过程:锻造→正火→齿形加工→渗碳→淬火低温回火→喷丸→校正花键孔→磨齿 。 常用材料;20Cr、20CrMnTi、20MnB
A.
正确
B.
错误
【单选题】C Many young people want to be pop stars. Pop stars are rich. Many people think they are leading a happy and easy life. In fact, they have very hard lives. They spend much of their time on travel. Som...
A.
singer
B.
dancer
C.
player
D.
pianist.
【单选题】下列不属于 FileInputStream输入流的read()成员函数的是
A.
int read(byte b[],int offset,int len);
B.
int read(byte b[]);
C.
int read (int line);
D.
int read();
【单选题】下列说法正确的是（ ）
A.
SiH 4 比CH 4 稳定
B.
O 2- 半径比F - 的小
C.
Na和Cs属于第ⅠA族元素，Cs失电子能力比Na的强
D.
HClO 4 、H 2 SO 4 、H 3 PO 4 的酸性依次增强
【简答题】Many young people want to be pop stars. Pop stars are rich. Many people think they are leading a happy and easy life. In fact, they have very hard lives. They spend much of their time on travel. Somet...
【单选题】Many stars overhead are _______ to the naked eye.
A.
physical
B.
invisible
C.
tribal
D.
literal
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