A:从速度公式可以得出,速度跟物体通过的路程成正比
B:从速度公式可以得出,速度跟物体运动的时间成反比
C:比较物体运动的快慢,可以比较相同时间运动的路程
D:比较物体运动的快慢,必须比较相同路程内所用的时间
若⊙O1、⊙O2的直径分别为6和8,圆心距O1O2=7,则⊙O1与⊙O2的位置关系是( )
根据对话语境,在空白处填写恰当的句子补全对话A: Good morning!B: Good morning! I’d like to join the school volunteer project, but____ .A: OK, don’t worry. Let me help you.____ ?B: I love singing and telling stories.A: Well, you could help look after young children on weekends.B: ____ . I can sing for them and tell them stories. I’m sure that children will love me.A: I agree with you. ____ ?B: Sure. I am Peter White. My telephone number is 885-276.A: OK. I’ll call you as soon as possible.B: ____ .A: It’s my pleasure.
某小组将调查到的生物进行了分类,他们将鲫鱼、水草、水鸭、蟹等归为一类,而将松、蝇、玫瑰、麻雀等归为一类。他们是按照什么归类的:( )