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简述养老保险的含义。

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？The following doughnut chart shows the numbers of cars with varying number of occupants before and after a Share-a-Ride program according to a survey implemented by the Plant Security Department on two Thursdays.
？Using the information from the chart, write a report assessing the effectiveness of the program.
？Write 120--140 words on your Answer Sheet.

若电源电动势为 E ,通过电源的电流为I ,则电源电动势的电功率为() 。
A P=EI
B P=EI2
C P=E/I

十八大以来，我们坚持适应把握引领经济发展新常态，立足大局，把握规律。()

当电阻R两端的电压U一定时,电阻R消耗的电功率P与()成反比。
A 电阻R的大小
B 电导的大小
C 电流I的大小