【单选题】My mother's sister is my _____. [ ]
【单选题】My father's sister's son is my ____________. [ ]
【单选题】药物临床前安全性评价研究必须执行( )。
【简答题】用等值演算法判断下列公式的类型,对不是重言式的可满足式,再 求出成真赋值 . (p ∨ q) → (p ∧ r)
【单选题】My father's sister is my _______. [ ]
【多选题】下列乙类传染病中采取等同于甲类传染病预防控制措施的有
【单选题】My mother's sister is my _____. [ ]