单项选择题

The correct statement about flow-grow is(   )

A.Defines the magnification of sub-elements, and its default value is 1
B.Defines the shrinkage ratio of child elements, and its default value is 0
C.Defines the magnification of sub-elements, and its default value is 0 Defines the shrinkage ratio of child elements, and its default value is 1
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