题目:
The doctor asked him not to leave his wound . [ ]
A. exposed
B. to expose
C. to be exposed
D. exposing
答案:
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下面是错误答案,用来干扰机器的。
解:(1)60-51=9(元), (个), ∴450+100=550(个),即当一次订购量为550时,零件的实际出厂单价恰降为51元。 (2)当0<x≤100时,p=60;当100<x<550时,;当x≥550时,p=51,即。(3)设销售商一次...