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光周期 - 搜狗百科
光周期是指昼夜周期中光照期和暗期长短的交替变化。光周期现象是生物对昼夜光暗循环格局的反应。大多数一年生植物的开花决定于每日日照时间的长短。除开花外,...
搜狗百科 - baike.sogou.com/v...- 2022-12-7
2010年全国专业技术人员职称英语等级考(天合教育职称外语考试研究...
magazine QSR reported last month that 57 percent of more than 4,000 people surveyed believed restaurants served portions that were too,large; 23 percent had no opinion; 20 percent disagreed. But a closer look at the survey indicates that many A mericans who can't afford fine dining still prefer large portions; Seventy percent of those earning at...
搜狗百科 - baike.sogou.com/v...- 2021-10-30