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【单选题】
设函数【图片】在区间【图片】内具有导数,且【图片】,则曲线【图片】在区间【图片】内( ).
A.
递增且是上凸的
B.
递减且是上凸的
C.
递增且是下凸的
D.
递减且是下凸的
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【单选题】The figure shows a statically indeterminate straight rod, an AC section is steel, and a CB section is aluminum. Then the bound forces N A and N B (in the direction shown) at the A and B ends satisfy t...
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【多选题】下列各项记账方法中,属于复式记账法的有( )。
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B.
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C.
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A.
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B.
hardly
C.
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D.
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A.
increases.
B.
decreases.
C.
increases and then decreases.
D.
decreases and then increases.
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A.
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B.
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C.
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D.
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【简答题】Mr. Smith 36 from London. Now he is in China. He is 37 .He teaches 38  a middle school. He works very hard. His students like  39 very much. He can 40  a little Chinese. His students often teaches h...
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