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问题 选择题

一辆汽车以速度v1匀速行驶全程的

2
3
的路程，接着以v2=20km/h走完剩下的路程，若它全路程的平均速度v=28km/h，则v1应为（　　）

A．24km/h

B．34km/h

C．35km/h

D．28km/h

答案

全程平均速度v=

x
t
=
x
2x
3
v1
+
x
3
v2
，代入数据，得v1=35km/h．故C正确，A、B、D错误．

故选C．

判断题

上市公司向原股东配售股份的，控股股东不得在股东大会召开前公开承诺认配股份的数量。( )
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单项选择题

Your ARPA has been tracking a target and has generated the targets course and speed.The radar did not receive a target echo on its last two scans due to the weather.What should you expect under these circumstances（）.

A.The ARPA will generate data as if the target was still being tracked by radar

B.The ARPA will give an audible and/or visual lost target alarm

C.The ARPA will generate data based on sea return echoes from the vicinity where the target was lost

D.The ARPA has lost all memory of the target and must recompute the target data
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