今年十一长假，爸爸驾车带小明从淮北市体育场出发去龙脊山游玩，体育场距龙脊山约25km，共用时间30min，爸爸驾车带小明从淮北市体育场去龙脊山平均速度为______km/h．回来时带了许多山货，车子的平均速度为45km/h，返程车的惯性比去时______ （选填“大”或“小”）．
（1）v=
=s t
=50km/h．25km 0.5h
（2）旅游回来时，带来很多山货，汽车的总质量比原来大，所以返程时汽车惯性大．
故答案为：50；大．
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| We have many 1 . They are tomatoes, carrots 2 broccoli. Vegetables have many 3 . They are green, red, yellow and white. The green vegetables 4_ the best(最好的 ). We eat many green vegetables 5 . They are good for 6 . And they are 7 food. We can make(做) vegetable salad. I have lots 8 vegetable salad for breakfast. My sister Lucy 9 a baseball player. She likes 10 ,so she eats fruit salad. | |||
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