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【判断题】
有向线段就是向量,向量就是有向线段A.
正确
B.
错误
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【简答题】阅读理解。 Have you ever received a gift that was so clearly not your taste that you wondered if perhaps it had been handed to you by mistake? Worse, have you ever given a present and watched your friend l...
【简答题】Life on land probably began about 430 million years ago, though it has existed in the water for perhaps as much as 3,000 million years. When we think of the first thing on land, we probably think of s...
【单选题】下列叙述中哪项与普茶洛尔不符
A.
为非选择性β-受体阻断剂
B.
对热及光均稳定
C.
分子中含手性碳原子,S -构型异构体的活性强于R-构型的异构体
D.
与硅钨酸试液反应, 生成淡红色沉淀
E.
主要代谢物为α –萘酚, 以结合形式排泄
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