【单选题】下面正确的是( )
A.
若关系模式R符合3NF条件,则R一定符合2NF条件。
B.
如果关系模式R∈1NF,且它的每一个非主属性既不部分依赖、也不传递依赖于任何候选码,则R∈3NF。
【单选题】中国共产党第十八次全国代表大会提出中国特色社会主义的总任务是( )。
【单选题】My former school is now very different from______ it was when I was there.
【单选题】听力原文:M: Do you often hear from your family? W: I used to get a lot of letters, but now they're getting fewer. My parents are really busy with their work. What do we learn from the woman's words?
A.
She has more letters now than before.
B.
She doesn't have so many letters as before.
C.
She often hears from her family now.
D.
She is used to having a lot of letters.
【单选题】中国共产党第十五次全国代表大会是第一次提出了党在社会主义初级阶段的()。
【判断题】开口孔隙和闭合孔隙都能够提高材料的隔热保温性能
【单选题】阵发性室上性心动过速合并心力衰竭患者的首选药物是
【单选题】严重肝功能不良病人需用糖皮质激素治疗时不宜选用()
【单选题】中国共产党第十五次全国代表大会第一次提出了党在社会主义初级阶段的( )。
【单选题】严重肝功能不良的病人不宜选用何种糖皮质激素