育肥肉猪的粗纤维最好控制在（）的范围内。
参考答案：6%-8%
(2013·江苏，22)The president of the World Bank says he has a passion for China，________he remembers starting as early as his childhood.
A．where
B．which
C．what
D．when
在资料已分组时，形成变量数列的条件下，计算算术平均数或调和平均数时，应采用简单式；反之，采用加权式。（）
