My friend Tom lives on Sun Street. It is near his school. He usually goes to school on foot. But sometimes he goes to school by bike. His father is a doctor. He goes to work by car. His mother is a teacher. She teaches English. She goes to work by metro. Today is Sunday. Tom doesn't have any lessons. He wants to go to Nanjing by train.

家庭电路的电压是____ V，对人体的安全电压是不高于____ V。电路中的电视机、电冰箱、电脑等用电器之间的连接方式是____ 联。影响导体电阻大小的因素有____  、____   、____  和____ 。

福建省地处中国东南沿海，属于亚热带气候。森林覆盖率65.95%，继续位居全国首位，生态环境状况指数继续保持全国前列。福建全省环境质量持续保持优良，是水、大气、生态全优的省份之一。