【简答题】带状地形图的测图比例尺一般采用( )或( ),测图宽度一般为500m左右
【单选题】An experiment has three possible outcomes, I, J, and K. The probabilities of the outcomes are 0.25, 0.35, and 0.40, respectively . If the experiment is to be performed twice and the successive outcome...
【单选题】10月1日,CBOT主要市场指数期货的市场价格为472,某投机者预期该指数期货的市场价格将下跌,于是以472的价格卖出20张12月份到期的主要市场指数期货合约,市场指数每点价值为250美元,若市场价格上涨至488,则他( )