在两个密闭容器中，分别充有质量相等的甲、乙两种气体，它们的温度和密度均相同。试根据甲、乙的摩尔质量（M）的关系，判断下列说法中正确的是（ ）
| A．若M（甲）<M（乙），则分子数：甲<乙 |
| B．若M（甲）>M（乙），则气体摩尔体积：甲<乙 |
| C．若M（甲）<M（乙），则气体的压强：甲>乙 |
| D．若M（甲）>M（乙），则气体体积：甲<乙 |
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