当机组采用先慢后快的两段折线式导叶关闭规律时，蜗壳进口压力只有单峰。
Secondly, if the two-segment closing law, the guide vanes close slowly first and then faster, only one pressure peak will be left.
一种是先开花后长叶，另一种是先叶后开花。
One blooms before its leaves come out, the other blooms afterwards.
烤烟生长发育后期，同一留叶数条件下，叶片NR活性、根系活力随着施氮量的增加呈先升高后降低的趋势；
In the late stage of flue-cured tobacco growth, under the same level of leaf number, leaf NR activity and root activity increased and then decreased with the increase of nitrogen application.
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