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实验控制法
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实验控制法
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experimental control method
实验控制法
根据一定的目的选择研究对象,设计一个特定的、非自然状态的环境,人为地改变和控制某些因素,然后观察其结果的科学研究方法。
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Nearch crater
near-circular orbit
near-collision nebula
near-compactness
near-contact binary
near continuity
Near Death
near degeneracy
near-Earth asteroid
near-earth asteroid
near-earth asteroid belt
Near Earth Asteroid Rendezvous
Near Earth Asteroid Rendezvous probe
Near Earth Asteroid Rendezvous - Shoemaker
Near-Earth Asteroid Tracking
near-earth comet
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Near-Earth Object Surveillance Satellite
near-earth orbit
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near-earth space
near edge X ray absorption fine structure
near edge X-ray absorption fine structure
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