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【单选题】
设 ,则 在点x=0处( )A.
左导数存在，右导数不存在
B.
左导数不存在，右导数存在
C.
左、右导数都存在
D.
左、右导数都不存在
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【单选题】We have all heard the story of how the young, impoverished Abraham Lincoln trekked miles to borrow books from a neighbor and then read them by firelight. We know that nineteenth-century readers would ...
A.
explain something about Abraham Lincoln and Dickens to readers.
B.
convince readers of the importance of books.
C.
delight readers with entertaining material from books.
【单选题】As we all know, the film Go Lala Go[《杜拉拉升职记》]is ________from a famous novel written by Li Ke.
A.
adopted
B.
adjusted
C.
adapted
D.
absorbed
【单选题】In reading this novel, we feel as if located in the _______ mythical or fairy world and derive boundless joy from it.
A.
ascendant
B.
equivocal.
C.
discreet.
D.
credulous.
E.
grotesque
【简答题】如图所示桁架，零杆个数为 。【图片】
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