什么是植物的休眠?试分析种子生理休眠的可能原因有哪些?(5分)
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Lesson 16 模拟通话练习-2C: CES5231, continue approach runway 18, the landing aircraft is still vacating the runway.
Lesson 16 模拟通话练习-3C: CES5231, wind 210 4m/s runway 18, cleared to land, caution wake turbulence
Lesson 16 模拟通话练习-4C: CES5231, vacate via first fast turn-off right, contact Ground on 121.8 when vacated.PIL: ____________________________________________________