未知题型 What's the meaning of the sentence '…the Kremlin's propaganda machine has been in full swing'?A.The Russian media has turned from side to side as it doesn't know which side to stanD.B.The Russian media has shown an overwhelming support for Yanukovych.C.Different reports from Kremlin's media made the public swing from time to timE.D.Unlike Western media, Kremlin's propaganda machine has taken a neutral stanD.

单项选择题 通过变异操作,使遗传算法具有局部的随机搜索能力。对此,下列说法不正确的是( ) A、当产生一个可行解时,可以在该解的邻近解的集合中进行搜索,被称为局部搜索;该解的邻近解的集合是变化的,例如与该解有一位不同的邻近解、与该解有两位不同的邻近解,或者与该解有一个“位组合”不同的邻近解等; B、当产生一个可行解时,由于与该解的邻近解的集合可能很大,并不能穷举每一个邻近解,所以需要随机选择邻近解; C、当产生一个可行解时,通过某一位或几位的变异,便可产生该解相邻近的解。即相当于,以该解为中心,在与该解的邻近解的集合中随机选择出某个解; D、当产生的可行解接近最优解的邻域时,通过某一位或几位的变异,便可产生该解相邻近的解,此有助于使算法加速向最优解收敛; E、以上说法有不正确的;

未知题型 The passage suggests that the purpose of the 'hydrographic network' is to ______.A.determine the size of molecules of waterB.prevent soil erosion caused by floodingC.move water from the Earth's surface to the oceansD.regulate the rate of water flow from streams and rivers