【单选题】What service do the concierge staff offer?
【判断题】PEG有两种基本的压缩算法:一种是采用以预测技术为基础的无损压缩算法;另一种是采用以离散余弦变换为基础的有损压缩算法。
【简答题】采用【】方法开启服务后,多次调用该方法,只会执行onStart方法.
【判断题】The concierge service should offer the guests service of luggage and accompany guests to their rooms.