Visitors to museums are attracted by ________.
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Works of art on loan exhibitions are_________ private owners, art dealers or other museums.
The last paragraph is about________.
Match a sentence part from the left column to one from the right column to make true statements.
若函数f(x)在[0, +∞]内可导,且f`(x) >0,f(0) <0则f(x)在[0,+ ∞]内有( )
A. 唯一的零点
B. 至少存在有一个零点
C. 没有零点
D. 不能确定有无零点