一种商品打八折出售，就是售价比原价降低80%．______．（判断对错）
1-80%=20%；
现价比原价降低了20%，不是80%．
故答案为：错误．
辨析：任何哲学都是自己时代的精神上的精华，都是科学的世界观和方法论。
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蛛网膜下腔出血急性期应绝对卧床休息_____周。
