一般基岩表面的坡度越大,坡积土的稳定性就( )
A:越大
B:越小
C:不一定
D:无法判断
2017年春节期间,北上广深这些一线城市都至少有一半的人返乡过年,其中一些金融行业从业人员多选择高效便捷的交通方式。深圳的空城率达到69%,为四城最高,堪称名副其实的“空城”。据此完成下面小题。
一次远足,小明与小聪分别从A,B两个景点出发,沿同一条公路相向而行.他们出发的时间是上午8:00,小聪行走的速度是小明的45, A,B两个景点之间的路程是9千米.设小明行走的速度为x千米/小时.(1)经过t小时,在小明和小聪相遇前,他们相距多少千米?(2)如果小聪行走的速度是4千米/小时,那么到几时几分,小明与小聪相距3千米?
Many students take the school bus to school every day. Parents think taking the school bus is usually safe (安全的), but sometimes it is dangerous. Some students don't keep the school bus rules. What are the school bus rules?
Arrive at the bus station early.
Wait for (等候) the school bus at the bus station.
Don't run at the bus station.
Don't walk or fight on the bus.
Don't get off (下车) the bus when it goes.