If the bilateral exchange between U.S. dollars and euros is listed as 1.1875 $/€, how many euros would buy $1? A: 0.8421€ B: 1.187€ C: 0.1875€ D: 8.421€
If the bilateral exchange between U.S. dollars and euros is listed as 1.1875 $/€, how many euros would buy $1? A: 0.8421€ B: 1.187€ C: 0.1875€ D: 8.421€
若随机事件A与B为随机事件，P(B)=0.8，P(B-A)=0.2，当A与B独立时，则P(B|(A∪B))=_______； A: 0.8421 B: 0.9321 C: 0.7623 D: 0.8621
若随机事件A与B为随机事件，P(B)=0.8，P(B-A)=0.2，当A与B独立时，则P(B|(A∪B))=_______； A: 0.8421 B: 0.9321 C: 0.7623 D: 0.8621
内可逆的卡诺热机，工作于2000K和300K的热源间，工质的高温为1900K，工质的低温为400K，设每一循环中工质从高温热源吸热100kJ/kg。则热机的效率为： A: 0.85 B: 0.8421 C: 0.8 D: 0.7895
内可逆的卡诺热机，工作于2000K和300K的热源间，工质的高温为1900K，工质的低温为400K，设每一循环中工质从高温热源吸热100kJ/kg。则热机的效率为： A: 0.85 B: 0.8421 C: 0.8 D: 0.7895
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