气缸内盛有一定量的氢气（可视作理想气体），当温度不变而压强增大1倍时，氢气分子的平均碰撞次数<img src="/Image1/69/69e9b9c026cc672d493b9dd67dbfe0fe.png" />和平均自由程<img src="/Image1/67/67f137f03f565501ca67486746ef2242.png" />的变化情况是：（）<br>A:<img src="/Image1/69/69e9b9c026cc672d493b9dd67dbfe0fe.png" />和<img src="/Image1/67/67f137f03f565501ca67486746ef2242.png" />都增大1倍<br>B:<img src="/Image1/69/69e9b9c026cc672d493b9dd67dbfe0fe.png" />和<img src="/Image1/67/67f137f03f565501ca67486746ef2242.png" />都减为原来的一半<br>C:<img src="/Image1/69/69e9b9c026cc672d493b9dd67dbfe0fe.png" />增大1倍而<img src="/Image1/67/67f137f03f565501ca67486746ef2242.png" />减为原来的一半<br>D:<img src="/Image1/69/69e9b9c026cc672d493b9dd67dbfe0fe.png" />减为原来的一半<img src="/Image1/67/67f137f03f565501ca67486746ef2242.png" />而增大1倍