如图所示是某质点的运动图象，由图象可知（ ）
A．这是速度-时间图象
B．这是位移-时间图象
C．1s内的位移是3m
D．1s末的速度是3m/s
A、图象纵坐标为速度，横坐标为时间，为速度-时间图象，故A正确，B错误；
C、速度图象与时间轴围成的面积等于物体通过的位移，则1s内的位移是x=
×1×3=1.5m，故C错误；1 2
D、由图象直接看出1s末的速度是3m/s，故D正确．
故选：AD
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| It is interesting to visit another country. But sometimes there are problems when we don't know the 1 very well. It may be 2 to talk with the people there.We may not know how to use the telephone i n the country we are 3 . We may not know how to buy the things we 4 . In a strange country we might even not know where to eat or what to order in a 5 . It's not easy to decide 6 money you should give to the waiters and the taxi drivers as a tip(小费). When we need 7 ,we might not know who to ask for help. It is not pleasant to have an 8 like that. Maybe we can 9 what to do and what to say in a short time. But when we start to enjoy the life in another country, we have to 10 . And when we get back home,we will be sorry for the visit. | ||||
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