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单项选择题

按四分法取样时，则取样的数量随粒径的增大而______A、增加B、减少C、不变D、改变

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问答题
Use [填空1] language to present your work. Avoid [填空2] unless you're really positive that yours will be a specialist-only audience.
不定项选择
‎在有理数范围内，集合有下确界。‍
A．错误
B．正确
判断题
Most criticism for knowledge deficits has been thrust upon students as they are supposed to learn better.
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