【简答题】某鱼塘捕到100条鱼,称得总重为150千克,这些鱼大小差不多,做好标记后放回鱼塘,在它们混入鱼群后又捕到102条大小差不多的同种鱼,称得总重仍为150千克,其中有2条带有标记的鱼。 (1)鱼塘中这种鱼大约有多少千克? (2)估计这个鱼塘可产这种鱼多少千克?
【简答题】某鱼塘捕到100条鱼,称得总重为150千克,这些鱼大小差不多,做好标记后放回鱼塘,在它们混入鱼群后又捕到102条大小差不多的同种鱼,称得总重仍为150千克,其中有2条带有标记的鱼. (1)鱼塘中这种鱼大约有( )条; (2)估计这个鱼塘可产这种鱼( )千克.(精确到0.1)
【单选题】循环语句“ for( var i=0, j=10; i!=j; i++j--)”循环次数是()
【单选题】● Using the figure in the Special window, Activity 'D' has a latest start time of _____ weeks and a latest finish time of _____ weeks.
【单选题】___ I saw her, she was working in a shop.
【单选题】—Did you watch the basketball match last night? —Yes. Jeremy Lin didn’t play ______ he did last week.
【单选题】LAST WEEK'S TOTAL HOURS WORKED AND HOURLY WAGES FOR THE CASHIERS AT MARKET X Note: Last week no more than two cashiers worked at any one time, no cashier worked more than 12 hours on the same day, and...