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【单选题】
如图示为在北戴河旅游景点之一的河场有两个坡度不同的滑道AB和AB/（看作斜面）。甲、旅游者分乘两个撬从插有红旗的A点由静止出发同时沿AB和AB/滑下，最后都停在水平沙面BC上．设撬和沙面间的动摩擦因数处处相同，者保持一定姿势坐在撬上不动。下列说法中正确的是（）A.
甲在B点的速率等于B/点的速率
B.
甲的滑行总路程比乙短
C.
甲全部滑行过程的水平位移一定比乙全部滑行过程的水平位移大
D.
甲、乙停止滑行后回头看A处的红旗时视线的仰角一定相同
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【简答题】请根据第一次课所讲的关于“选题”的内容,结合自己的专业,自拟一个论文选题,在线提交作业的时候,请按照“题目——专业”的方式提交。
【简答题】Describe a success you have had when you were young. You should say: what it was and when it happened why you chose this area of activity how easy or difficult it was to achieve and explain how import...
【单选题】It was most of you to lend me money when I was in trouble.
A.
selfish
B.
generous
C.
relieved
D.
outgoing
【简答题】Describe a piece of work you did fairly quickly. You should say: what work it was why you did it quickly how easy or difficult it was and explain what the result was. [You will have to talk about the ...
【单选题】It was wrong of you to from all your friends who helped you when you were in trouble．
A.
break away
B.
break down
C.
break into
D.
break out
【单选题】It was very kind help me when I was in need.
A.
from you to
B.
for you to
C.
of you to
D.
that you
【单选题】IP地址中,关于C类IP地址的说法正确的是()
A.
可用于中型规模的网络
B.
在一个网络中最多只能连接254台设备
C.
此类IP地址用于多目的地址传送
D.
此类地址保留为今后作用
【单选题】How very delightful ___ to suggest this!
A.
it is you
B.
it was for you
C.
it is of you
D.
it was you
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