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【单选题】
假定雨伞面完全水平,旋转时,其上一部分雨滴甩出来,下面关于伞面上雨滴的受力和运动情况的说法中正确的是
A.
雨滴离开雨伞时是沿背离转轴的方向离心而去的
B.
越靠近转轴的雨滴所需的向心力越小
C.
越远离转轴的雨滴所需的向心力越小
D.
雨滴离开雨伞后对地的运动是匀速直线运动
题目标签:
雨伞
水平
运动情况
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参考答案:
举一反三
【简答题】阅读理解。 (1) Jim and his father take a walk after supper . Suddenly it begins to rain. It rains harder and harder. They don't have the umbrellas (雨伞) with them and there is no place to hide from (躲避) the...
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【简答题】用于制作雨伞的金属伞骨
查看完整题目与答案
【单选题】如图所示,当膈肌由A状态向B状态变化时,人体的呼吸状态及膈肌运动情况分别是( )
A.
吸气,膈肌舒张
B.
呼气,膈肌舒张
C.
吸气,膈肌收缩
D.
呼气,膈肌收缩
查看完整题目与答案
【简答题】根据大气在垂直方向上物理性质和运动情况的变化可将大气分为( )、( )、( )、( )、( )。
查看完整题目与答案
【简答题】钢铁制雨伞用弹簧
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【判断题】下雨天时,门童应为客人提供雨伞,并为客人擦干净鞋底,锁好雨伞,以免污染大堂地面()。
A.
正确
B.
错误
查看完整题目与答案
【单选题】雨伞效应描述的是()
A.
一号
B.
二号
C.
四号
D.
五号
查看完整题目与答案
【简答题】It was a beautiful spring morning. There were no clouds in the sky, and the sun is warm but not hot. Mr. Black saw an old man at the bus stop with a big, strong, black umbrella(雨伞)in his hand. 小题1:Thi...
查看完整题目与答案
【单选题】雨伞的发明是应用了( )
A.
空间分离
B.
时间分离
C.
基于条件的分离
D.
系统级别的分离
查看完整题目与答案
【单选题】请根据下面短文回答第66~70题: One day Jack’s wife was cleaning the house. "Look at all these umbrellas (雨伞) ," Jack’s wife said to him. "There are eight and they are broken." "I’ll take them all to the umbrella s...
A.
As he sat down, a woman behind him said, "You have certainly had a successful(成功的)day!"
B.
He turned around and saw the woman he had seen the day before.
查看完整题目与答案
相关题目:
【简答题】阅读理解。 (1) Jim and his father take a walk after supper . Suddenly it begins to rain. It rains harder and harder. They don't have the umbrellas (雨伞) with them and there is no place to hide from (躲避) the...
查看完整题目与答案
【简答题】用于制作雨伞的金属伞骨
查看完整题目与答案
【单选题】如图所示,当膈肌由A状态向B状态变化时,人体的呼吸状态及膈肌运动情况分别是( )
A.
吸气,膈肌舒张
B.
呼气,膈肌舒张
C.
吸气,膈肌收缩
D.
呼气,膈肌收缩
查看完整题目与答案
【简答题】根据大气在垂直方向上物理性质和运动情况的变化可将大气分为( )、( )、( )、( )、( )。
查看完整题目与答案
【简答题】钢铁制雨伞用弹簧
查看完整题目与答案
【判断题】下雨天时,门童应为客人提供雨伞,并为客人擦干净鞋底,锁好雨伞,以免污染大堂地面()。
A.
正确
B.
错误
查看完整题目与答案
【单选题】雨伞效应描述的是()
A.
一号
B.
二号
C.
四号
D.
五号
查看完整题目与答案
【简答题】It was a beautiful spring morning. There were no clouds in the sky, and the sun is warm but not hot. Mr. Black saw an old man at the bus stop with a big, strong, black umbrella(雨伞)in his hand. 小题1:Thi...
查看完整题目与答案
【单选题】雨伞的发明是应用了( )
A.
空间分离
B.
时间分离
C.
基于条件的分离
D.
系统级别的分离
查看完整题目与答案
【单选题】请根据下面短文回答第66~70题: One day Jack’s wife was cleaning the house. "Look at all these umbrellas (雨伞) ," Jack’s wife said to him. "There are eight and they are broken." "I’ll take them all to the umbrella s...
A.
As he sat down, a woman behind him said, "You have certainly had a successful(成功的)day!"
B.
He turned around and saw the woman he had seen the day before.
查看完整题目与答案
参考解析:
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