求翻译：以每天两次的频率对全厂各Reflow炉进行测试监控，主要监控回流炉的上升斜率、预热时间、回流时问、峰值温度及氮气的各项指数是否在规格范围内。是什么意思？

Frequency of two times a day to test plant-wide Reflow furnace monitoring, main monitor the rising slope of reflow ovens, warm-up time, back when asked, peak temperature and nitrogen of the index is within a size range.