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【单选题】
当(x,y)→(0,0)时, f(x,y)=(xy^2)/(x^2+y^4) 沿 x=y^2 的极限为A.
k/(1+k^2)
B.
1/2
C.
1/16
D.
1/3
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举一反三
【简答题】Directions: Translate the following sentences with given phrases question of/out of question/out of the question/end up/be supposed to 4. 不 , 绝对不行。 Oh, no. No, it's .
【简答题】No. 5
【单选题】听力原文： The American colonists often quarreled with British Government. They had to buy British goods and they had to pay taxes to Britain. In 1767, Britain put customs duty on many goods, such as tea. ...
A.
American colonists.
B.
Red Indians.
C.
The Britain army.
D.
The American army.
【多选题】氟哌酸的特点有
A.
孕妇、哺乳期妇女可以使用
B.
氟哌酸可以引起重症肌无力症状加重
C.
葡萄糖-6-磷酸脱氢酶缺乏患者使用氟哌酸不会出现溶血反应
D.
可引起光敏反应
E.
大肠埃希菌容易耐药
【简答题】目前SDH信号的速率等级有几种？速率分别是多少？
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