A:垂直
B:斜交
C:平行
D:不能确定
——Thank you so much for your present. It's really nice.——____________
2路公交车从A站经过B站到达C站,然后返回,去时在B站停车,返回时B站不停车,去时速度每小时40千米,整个过程的时间与路程的关系如图中所提供的信息,
It took about two hundred years ____ as an analytical machine by Charles Babbage.