双交叉限位控制系统是实现燃烧炉控制的一种新型控制方法，一改以往静态“空燃比限位”的控制方式，实现动态比率限位控制。
Limit control system of expanding double-cross is a new control method, it changes control mode from former static state to dynamic one in controlling limit rate air to fuel.
上海新动态国际英语培训学校编辑整理佩尤研究中心（Pew Research Center）发现失业男性说他们“非常快乐”的比率（16%）要远低于从业男性（37%）。
The Pew Research Center found that the percentage of men who said they were "very happy" was significantly lower for unemployed men (16 percent) than for employed men (37 percent).
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