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下列的生活实例中,属于增大压强的是哪一项?()
A书包的背带较宽
B刀刃磨得很锋利
C大型运输车装有很多车轮
D在木椅上垫软坐垫
E不知道
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在日常生活中,我们经常根据不同的需求去增大或减小压强,下列哪种做法对于压强的改变与其他三项不同?A.沙发被设计得很柔软
B.滑雪板比放宽大
C.挖掘机上装有履带
D.破窗锤锤头被设计成锥形
考题
25、1845年焦耳完成了气体做自由膨胀的过程,下列哪种说法是正确的? In 1845 Joule completed the process of free expansion of gases, which of the following statements is true?A.体积增大,压强增大,温度升高; The volume goes up, the pressure goes up, the temperature goes up;B.体积增大,压强增大,温度降低; The volume goes up, the pressure goes up, the temperature goes down;C.体积增大,压强增大,温度不变; The volume goes up, the pressure goes up, the temperature stays the same;D.体积增大,压强减小,温度不变; The volume goes up, the pressure goes down, the temperature stays the same;
考题
1845年焦耳完成了气体做自由膨胀的过程,下列哪种说法是正确的? In 1845 Joule completed the process of free expansion of gases, which of the following statements is true?A.体积增大,压强增大,温度升高; The volume goes up, the pressure goes up, the temperature goes up;B.体积增大,压强增大,温度降低; The volume goes up, the pressure goes up, the temperature goes down;C.体积增大,压强增大,温度不变; The volume goes up, the pressure goes up, the temperature stays the same;D.体积增大,压强减小,温度不变; The volume goes up, the pressure goes down, the temperature stays the same;
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