夏天对人们有利的一面是____ ,不利的一面是____ 。
根据首字母提示完成下列短文。
A good class monitor gets on well w____ classmates and likes to h____ others. He often cleans the classroom and makes the classroom c____ just like h____. C____ him to be your monitor.
如图所示,在〇里填上适当的电表符号,当电键S闭合时,各用电器都能正常工作.
小明计划暑假期间从济南出发前往北京旅游,希望下午到达,根据以下列车时刻表,他应该选择的车次是( )