【单选题】【消耗次数：1】
实验设计的基本原则（ ）。
①
处理因素、受试对象、实验效应
②
对照、随机化、重复
③
齐同对比、均衡性、随机化
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相关题目
【单选题】
下列对比实验中，（ ）是最简便的一种实验调查法的实验设计。
①
单一实验组前后对比实验
②
实验组与对照组对比实验
③
实验组与对照组前后对比实验
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双实验组前后对比实验
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I’ll pick you up as promised, ____it rainy or fine.
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will
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be
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should
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no matter
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29. As they cant afford to let the situation get worse, they will take some necessary ____.
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decisions
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sides
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directions
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steps
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-I’m sorry I broke your mirror.-Oh, really? ____.
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It’s OK with me
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It doesnt matter
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Don’t be sorry
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The room was so quiet that she could hear the____ of her heart.
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hitting
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beating
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hurting
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____ the water sports — sailing, rowing, diving and swimming, I like rowing best. ?
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At all ?
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Above all ?
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Of all ?
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In ____ recent years, Niagara Fallshave come to be appreciated more for their natural beauty as _______ wonder of nature.
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the; a
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the; the
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/; the
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/; a
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awake…asleep ?
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awake…sleep ?
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waking…asleep ?
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wake…asleep ?
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would received
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has received
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had received
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with
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at
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to
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under
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realize ?
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mean ?
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think ?
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