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【单选题】
若x点是函数的第二类间断点，则在x点处函数（）。A.
极限值不等于这点的函数值
B.
左右极限都存在
C.
左右极限至少有一个不存在
D.
没有定义
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反馈参考答案：
举一反三
【单选题】When they moved to another community, Roberts problem is______.
A.
still existing
B.
solved by another doctor
C.
not further mentioned
D.
solved by the parents
【简答题】During the past six years, airline industry has been hit by terrorism, war, ______which made the industry suffer a total loss of $44 billion.
【简答题】A. Because she remembered that she had told the maid to shut it. B. Because she remembered that she had locked it by herself. C. Because she remembered that she saw the maid shut it. D. Because she re...
【简答题】市场营销环境泛指一切____的内部条件和外部环境的总和。
【单选题】When they moved to Canada，the children________the change very well. [ ]
A.
adapted to
B.
adopted to
C.
used to
D.
attempted to
【简答题】相邻的多个对象常用选择方法:先单击要选择对象列表中的第一个或最后一个对象,然后按住键盘上的 键不放,再单击要选择对象列表中的最后一个或第一个对象并释放该键。
【单选题】I wrote a letter of complaint, and the airline has promised to _____ the matter.
A.
look up
B.
look into
C.
look through
D.
look for
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