The focus of this book is to develop ______.
A. writing skill
B. reading skill
C. speaking and listening skills
D. listening, speaking, reading and writing skills
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两束频率相同、振动方向相同、传播方向相反的单色光波叠加后将会产生驻波现象。
A. 正确
B. 错误
在平行平板的双光束干涉中,干涉定域面位于无穷远处;平板越厚,中心条纹的干涉级次越高;入射光波长越长,条纹间隔越稀。
A. 正确
B. 错误
According to the passage, your persona is______.
A. your unconscious self
B. your innermost self
C. a hypocritical appearance
D. your variable mask presented to others
一束He-Ne激光从空气进入水中,则这束光传播速度变小,波长变小,因此颜色会发生变化。
A. 正确
B. 错误