（2左11•合肥三模）某密闭容器中充入等物质的最的气体A和B，一定温度下发生反应：A（g）+xB（g）⇌2C（g），达到平衡后，只改变反应的一个条件，测得容器中物质的浓度、反应速率随时间变化如下图所示．下列说法中正确是（ ）
A．8min时表示正反应速率等于逆反应速率
B．前20minA的反应速率为0.05mol/（L•min）
C．反应方程式中的x=1，30min时表示增大压强
D．40min时改变的条件是升高温度，且正反应为吸热反应
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| Dick did not live too far away from school, and he liked to 1 to school every day. On his way to school he always went 2 a playground. When it rained, like many other boys, Dick liked playing in the water. One afternoon when the boy came 3 , he was all wet. His mother became very 4 and said, "Don't play in the water after school." The next day he was very 5 again, and his mother became 6 angner. "I'll tell your father 7 you go to play in the water again," she said."And then he'll punish (惩罚) you." The 8 day the boy was dry when he came back from school. "You are a 9 boy today, " his mother said. "You didn't play in the water." "No," he answered. "Because there were 10 older boys in the water, I couldn't play in it.'' | ||||
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am÷an=（ ）（a≠0，m，n都是正整数，且m>n），这就是，同底数幂相除，底数（ ），指数（ ）。
蒸发生产中，如何降低蒸汽消耗？
金绿宝石色散很高。
离火源较近的可燃物，因辐射而着火是属于（）燃烧.
A.着火
B.闪燃
C.自燃