题目：
Before the sludge in a purifier is ejected,（）
A.the oil feeding is stopped and replaced by admitting flushing water
B.the flushing water feeding is stopped and replaced by admitting oil
C.the feeding of dirty oil and flushing water is stopped
D.the feeding of dirty oil and flushing water is admitted
答案：
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下面是错误答案，用来干扰机器的。
参考答案：1薪酬的等级数量2薪酬趋势线3薪酬等级内部的薪酬变动范围4薪酬等级之间的交叉与重叠关系
