Last month, one of my classmates, Sally was sad. Her father got ill and stayed in hospital. She had to look after him. So she missed a lot of lessons. In the English exam she failed.
During those days she was worried about her
“相逢点点头,握手问个好;感情要真诚,语言要美好”。这句话告诉我们( )
一列动车在高速铁路上行驶的时间和路程如图.看图填写如表:
时间/小时
3
路程/千米
800
① 这列动车行驶的时间和路程成____比例
②照这样的速度,行1800千米需要____小时.
关于各大洲的分界线的叙述,正确的是( )
小汽车以速度15m/s行驶,货车以速度10 m/s行驶;如果小汽车的车长为4.5 m.货车的车长为8 m,那么小汽车从货车后面恰好超越货车所需时间是( )