人工养殖的水产动物品种遗传特点表现为：群体数量大，随机交配，杂合度低。
《中华人民共和国宪法》规定：“中华人民共和国公民有受教育的（）。” ["权利","义务","权利和义务","资格"]
以实玛利受割礼的时候是多少岁？
Which statements about MPLS Label Distribution Protocol（LDP） are valid？（） ["LDP hello packets are sent to UDP port 646","LDP hello packets are sent to TCP port 711","LDP sessions are TCP sessions to port 646","LDP sessions are TCP sessions to port 711","LDP establishes a peer relationship with another router that must be directly attached","LDP can establishes a peer relationship with another router that is not directly attached"]
洁净区的设计必须符合相应的洁净度要求，包括达到（）和（）的标准。
急性期黄疸性肝炎的分期和临床表现？
