截至2007年底，在生产资料销售总额中，由市场形成价格的比重已经占到（）。
A.95.1%
B.97.1%
C.92.4%
D.96.4%
参考答案：C
All mammals have hair, but not always evident.()
A. but it is not
B. but it is
C. but they are not
D. but they are
电泳过程中电泳管为何要固定好？
