一点如果在某瞬时的法向加速度等于零,而其切向加速度不等于零,尚不能决定该点是作直线运动还是曲线运动
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蛙泳腿部练习时,要多收大腿,因为大腿比较有力更容易走水。
A. 对
B. 错
游蛙泳时主要是靠蹬的力量走水,其实夹腿并不重要。
A. 对
B. 错
请注意答案单词需要区分大小写!I've spent a lot of time living in 1)________.so there isn't one place i thnk of as 2)________ . I've lived in Scotland and Poland and China. I love going to 3)________ and learning about 4)________ . Today, I'm asking people about travel.
Python语句>>> f = lambda x, y=3, z=5: x*y*z>>> f(2)程序运行结果是()。
A. 6
B. 12
C. 15
D. 30