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
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营业人员()佩戴工号牌,或在柜台前放置工号牌。
A. 营业时
B. 服务时
C. 上岗时
D. 收寄时
O2O是近年来新兴起的互联网商业模式,他的全称是()
A. online to offline
B. offline to online
C. onwAy to offwAy
D. offwAy to onwAy