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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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论述光对植物生长有哪些方面的影响?(10分)

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: ____________________________________________________

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