题目内容

4. Which of the following statements is NOT true?

A. People are the same, but people are also different.
B. Stages of life have different values in different cultures.
C. All people have the same emotions, such as love and hate, happiness and sadness.
D. All people feel the same emotions in similar situations.

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6. The word "privilege" in the third paragraph means _____.

A. special gifts
B. special rights
C. special care
D. special treatment

纵波定义指的是

A. 振动方向和波的传播方向一致
B. 振动方向和波的传播方向相互垂直
C. 振源做横向振动的波
D. 振源做纵向振动的波

已知简谐振动方程x=a COS(bt+C),该振动的角频率为

A
B
C. c
D. x

关于振动和波的关系下列说法不正确的是

A. 有物体做机械振动,一定有机械波
B. 波的频率一定等于其波源振动的频率
C. 有物体做机械振动,不一定有机械波
D. 如果没有机械振动,一定没有机械波