题目内容

麻醉药品处方应保留E．

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氯霉素或抗肿瘤药所致的骨髓抑制，属于E．

I have to______my visit as I' 11 be very busy next week.

A. call for
B. call on
C. call off
D. call in

______ how to operate a switchboard, I had to ask the office supervisor to show me the correct procedures.

A. Not known
B. No to know
C. Not knowing
D. Having not known

戒毒药品处方应保留E．