cycle: n.1.循环，周期，一转。2.周时，周年，年纪。3.(诗、故事等的)始末。4.自行车，三轮车，摩托车。5.【电学】周波；【数学】环；【拓】闭链；【地质学；地理学】旋徊；【植物；植物学】(从枯凋到再生的)一轮迥；天体运转的轨道。短语和例子the business cycle 商业盛衰的周期性。 the life cycle 【生物学】生命周期，生活史。 the Arthuri
Instant check valve response prevents unnecessary vent discharge during pump " off cycle " 瞬间止回阀反应防止在泵“非周期”期间产生不必要的排气口排放。
3.
For ballasts with rest mode facility changeover from rest mode to normal mode shall occur automatically at greater than 0 . 9 times the off cycle extended to 3 s and the ballast put into the rest mode after 2 s of the off periods in the 500 switching cycles 带有休止状态装置的自容式应急灯具，从休止向正常状态的转换应在不大于0 . 9倍额定电压下自动运行3秒，在500次开关周期结束切断电源的2秒时间内应使自容式灯具进入休止状态。
