已知函数f(x)=(sinx-cosx)sinx，x∈R，则f(x)的最小正周期是（ 发布时间：2017-01-13 01:23 │ 来源：www.tikuol.com 题型：填空题 问题： 已知函数f(x)=(sinx-cosx)sinx，x∈R，则f(x)的最小正周期是（）．
题型：填空题 短文改错。 The earliest coins in world were used in China from about 650 BC. Coins may be of different in size, weight and shape, and they maybe made from different metals, Usually they have different designs on the two sides. There is usually the head of the well known person on one side. Today the coin is marked by the name of the country,the date and its valuable. In the past, many things could be used formoney, such like seashells, rings, bamboo sticks, wood and so on.The earliest coin in the west were made of gold, mixed with silver. Much collections of coins were discovered. The largest collection found in Britain contained about 200 000 silver penny that were all over 600 years old.1.____2.____3.____4.____ 5.____6.____ 7.____ 8.____ 9.____10.____ 查看答案
题型：填空题 如果采用“蛮力攻击”对密文进行破译，假设计算机的处理速度为1密钥/微秒，那么大约______时间—定能破译56比特密钥生成的密文。A．71分钟B．1.1*103年C．2.3*103年D．5.4*1024年 查看答案