问题
选择题
Does she like __________ at weekends?[ ]
A. going shopping
B. go shopping
C. go shop
答案
答案：A
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Does she like __________ at weekends?[ ]
A. going shopping
B. go shopping
C. go shop
答案：A
，从静止开始起动，沿水平面前进了
米后，就达到了最大行驶速度
，设汽车的牵引功率保持不变，所受阻力为车重的
倍．求：