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【单选题】
函数在某点极限存在是该函数在此点连续的A.
必要条件
B.
充分条件
C.
充要条件
D.
以上都不对
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【单选题】In our daily life, everyone fails every now and then. It is how you react that makes a_____.
A.
development
B.
difference
C.
progress
D.
point
【简答题】两药合用，一种药物能使另一种药物原有的功效降低或丧失，这种配伍关系是（ ）
【简答题】When I was a kid, my Mom liked to make breakfast food for dinner every now and then. And I remember one night in particular when she had made breakfast after a long, hard day at hospital. On that even...
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