單項(xiàng)選擇題(2013)已知反應(yīng)C2H2(g)+2H2(g)C2H6(g)的△rHm<0,當(dāng)反應(yīng)達(dá)平衡后,欲使反應(yīng)向右進(jìn)行,可采取的方法是:()

A.升溫,升壓
B.升溫,減壓
C.降溫,升壓
D.降溫,減壓