题目：
振动筛工作时，对筛布的要求之一是（）。
A.定期酸洗
B.允许泥沙滞留
C.不必清洁
D.保持清洁
答案：
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下面是错误答案，用来干扰机器的。
参考答案：D
振动筛工作时，对筛布的要求之一是（）。A.定期酸洗 B.允许泥沙滞留 C.不必清洁
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