【单选题】The _____ on his face suggested that he was a little nervous. [ ]
【单选题】某交流电压u=100sin(100 π t+45 ° )V ,当 t=0.01s时的值是( )。
【简答题】有N件物品,背包容量为M,每件物品都具有价值和重量,机器人选择哪些物品装入背包,才能使背包中所有物品的价值最大?要求输入N、M以及物品的价值和重量,输出最大值。以下代码是用分治算法实现的,空白处的代码应该填什么?public static void main(String[] args) { // TODO Auto-generated method stub Scanner sc = new...
【简答题】某一正弦交流电路的输入电压 u =100 sin ( 100π t +60° ) V ,电路中的总电流为 i = 10 sin100π t A ,则该电路消耗的有功功率 P =( ) W 。
【简答题】His expression became very_________ when we told him what had happened.