若在最优产出水平P超过AVC,但小于AC时,则企业是在()。
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
劳动法规定,劳动合同可以约定试用期,但最长不得超过12个月。
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