上午九点半的时候，完整的红黄绿信号灯变换周期大概为140秒。
At 9:30 am, the full red/yellow/green signal cycle might be 140 seconds.
建立了充填国产s101钒催化剂的、单段流向变换周期操作固定床反应器的非均相动态模型。
The heterogeneous transient model of a fixed - bed reactor packed with vanadium catalyst, S101, for catalytic oxidation of SO2 and operating in a flow direction switched periodically was developed.
这会导致变换的静止和活动的周期-与沙堆的堆砌和崩塌非常相像。
This results in alternating periods of quiescence and activity - remarkably like the build-up and collapse of a sand pile.
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