What does the Writer think about machines with human - like ability
A. He believes they will be useful to human beings.
B. He believes that they will control us in the future.
C. He is not quite sure in what way they may influence us.
D. He doesn't consider the construction of such machines possible.
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Which of the following is NOT MENTIONED in the passage（）
A. Gunpowder.
B. Needles.
C. Paddle boats.
D. Bridge design.
《合同法》最基本的原则是( )
A. 合法原则
B. 合同自由原则
C. 诚实信用原则
D. 鼓励交易原则
电子束焊机应有良好的地线装置，进行绝缘试验时，试验电压应为额定电压的( )倍。
A. 1
B. 1.2
C. 1.4
D. 1.5
DoS攻击的目的是（）
A. 获取合法用户的口令和帐号
B. 使计算机和网络无法提供正常的服务
C. 远程控制别人的计算机
D. 监听网络上传输的所有信息
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