【判断题】波源的振动频率与波的频率相同,波源的振动速率也与波的传播速率相同。
【单选题】The commercial is an ________ medium for advertising.
【判断题】波源的振动频率与波的 波动 频率相同,波源的振动速率也与波的传播速率相同。
【单选题】Jackie has an idea for the commercial. What is it?
A.
Nick sits on a park bench and a young kid approaches him.
B.
Nick plays in a soccer match and a large crowd cheers for him.
C.
Nick sits on a bench at the soccer field and puts on his shoes.
【单选题】The commercial is an ________ medium for advertising. ( )
【简答题】Listen to the commercial once again and complete the chart about the old process of starting Internet business. The following is an example of good notes. It keeps the essential information and presen...
【判断题】波源的振动频率与波的频率相同,波源的振动速率也与波的传播速率相同。