[问答] Select the following correct features regarding classical planning．选择如下有关经典规划的正确特征。 A.Fully observable in dynamic environment．动态环境中完全可观测。 B.Partly observable in a static environment．静态环境中部分可观测。 C.Keeping a nondeterministiaction at a time．每次保持不确定性的动作。 D.Keeping a deterministic action at a time．每次保持确定性的动作。 E.Onagent with only onknown initial stat一个智能体仅有一个已知的初始状态。 F.Several agents with multiple known initial states．若干个智能体具有多个已知的初始状态。