根据短文内容，回答下列问题。
   Linda and Mary are good friends. Linda is thirteen. She comes from the U.S.A. Mary is twelve. She's from London(伦敦). They study in the same school, but in different classes. Linda's father teaches English in a middle school. Her mother drives a car. Mary's mother works in an office. Her father is a doctor. Linda can speak English, French(法语) and a little Chinese. Linda's mother likes cooking. She likes eating rice. But Linda' s father doesn't. He likes drinking milk and eating bread. Mary's mother doesn't like cooking. But she likes doing some shopping. She can make nice skirts and dresses. Mary's father likes doing housework(家务).

同盟会纲领中：“驱除鞑虏，恢复中华，创立民国，平均地权”这里的“鞑虏”指的是 (     )                                                     

一辆汽车以72km/h的速度匀速行驶时，汽车牵引力的功率为12kW，72km/h=____ m/s，汽车受到的阻力____ N．