题目

A new camera made by a company named Netatmo has facial recognition software (识别系统) that can tell parents at work that their children have returned from school, or that a package has been taken to their home. It can also tell them if a stranger has entered their home. Janina Mattausch is a product marketing manager for Netatmo. The common security (安全) cameras at present are not that smart. So, they can tell you if something is moving but they don't necessarily know if it's a human being or, ah, if it's your kids --they don't know the difference, so they will warn you all th12．为避免测量的误差，可以采取的方法是（　　）A．测量一次，认真读数B．多次测量，取最大值C．多次测量，取最小值D．多次测量，取平均值