根据句首字母补全单词。

1. Thailand is a beautiful country, many people go s_____there year.

2. It's an e_____vacation. We played very happily.

3. Mike d_____to go fishing next Sunday.

4. I met an American t_____in the Summer Palace yesterday.

5. We're l_____for Beijing next Sunday.

动圈式传声器的磁路系统包括（）、（）和（）。动圈式传声器利用音圈切割磁力线产生感应电动势，完成声电转换。