反应2X(g)+Y(g) 2Z(g)+热量，在不同温度（T1和T2）及压强（P1和P2）下，产物Z的物质的量[n(Z)]与反应时间（t）的关系如右图所示。下列判断正确的是
| A．T1<T2，P1<P2 |
| B．T1<T2，P1>P2 |
| C．T1>T2，P1>P2 |
| D．T1>T2，P1<P2 |
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