皮皮学，免费搜题
登录
搜题
【简答题】
关系运算以关系代数为理论基础,关系代数的最基本操作是并、差、笛卡尔积、 _______ 、 _______ _。
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】在女性上生殖道感染的防御机制中,最重要的是 ( )
A.
双侧大阴唇自然闭合
B.
盆底肌肉的作用保持阴道口闭合，阴道前后壁紧贴
C.
阴道自净作用
D.
宫颈粘液栓
E.
子宫内膜期性脱落
【简答题】下列哪些项共同揭示了虚证产生的机制?() A正气不足 B邪气不太亢盛 C邪气亢盛 D正邪不能作剧烈斗争 E病势不亢盛
【简答题】冷冻马铃薯（蒸煮过）
【单选题】The sentence 'School and Einstein did not mix well.' really means ______.
A.
Einstein did not love his school
B.
Einstein couldn't do as his teachers told him to
C.
tile school was not fit for him
D.
there was no room for him in the school
【单选题】在女性上生殖道感染的防御机制中,最重要的是( )
A.
双侧大阴唇自然闭合手
B.
盆底肌肉的作用保持阴道口闭合，阴道前后壁紧贴
C.
阴道自净作用
D.
子宫颈粘液栓
E.
子宫内膜周期性脱落
【单选题】The sentence 'School and Einstein did not mix well.' really means ______.
A.
Einstein did not love his school
B.
Einstein couldn't do as his teachers told him to
C.
the school was not fit for him
D.
there was no room for him in the school
相关题目：
【单选题】在女性上生殖道感染的防御机制中,最重要的是 ( )
A.
双侧大阴唇自然闭合
B.
盆底肌肉的作用保持阴道口闭合，阴道前后壁紧贴
C.
阴道自净作用
D.
宫颈粘液栓
E.
子宫内膜期性脱落
参考解析：
知识点：
题目纠错 0
发布
