某温度下，有反应H2(g)＋I2(g)
2HI(g)；正反应为放热反应，在带有活塞的密闭容器中达到平衡。下列说法中正确的是
| A．体积不变，升温，正反应速率减小 |
| B．温度、压强均不变，充入HI气体，开始时正反应速率增大 |
| C．温度不变，压缩气体的体积，平衡不移动，颜色加深 |
| D．体积、温度不变，充入氮气后，正反应速率将增大 |
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