Prior to closing the breaker when paralleling two AC generators, the recommended practice is to have the frequency of the incoming machine （） ["slightly less than the line frequency","the same as the line frequency","slightly greater than the line frequency","All of the above"]
被测实际要素对其理想要素在方向或位置上的变动量称为（）。 ["形位误差","形位公差","位置误差","位置公差"]
如果你想让运行Windows 7的客户端用位于contoso内部的WSUS作为升级源而不是microsoft update服务器，你应该配置下列哪个策略？（） ["关闭软件通知功能","自动更新检查频率","配置自动更新","在本地配置内网的微软更新服务"]
可燃液体的蒸气与空气混合的浓度高于爆炸上限时，在氧气含量正常条件下，能燃烧或爆炸。
视神经萎缩症是受显性基因控制的遗传病，若一对夫妇均为杂合体，生了一个患病的男孩，如果再生一胎，是正常男孩的几率为（） ["25%","12.5%","75%","0"]
怎样表现摄影画面的深远？
