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【单选题】
函数 在点 极限存在是函数在该点连续的（）A.
必要条件
B.
充分条件
C.
充要条件
D.
无关条件
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皮皮学刷刷变学霸
举一反三
【简答题】棉短绒 ,其纤维长度不超过5毫米
【简答题】石灰岩的主要矿物成分是( ) A石英 B方解石 C白云石 D长石
【单选题】He has heard from his elder brother.
A.
has received his elder brother’s letter
B.
has heard of the news of his elder brother
C.
has bought a gift for his elder brother
【单选题】'His brother is teacher'______ He has a brother'.
A.
entails
B.
presupposes
C.
is inconsistent with
D.
is synonymous with
【单选题】Helen has two sisters and a brother. Her brother is working, but _________her sisters are still at school.
A.
neither
B.
either
C.
all
D.
both
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