溶液中AL2O3和SiO2浓度比为硅量指数,是衡量溶液质量好坏的指标。
参考答案:对
The information on the Internet gets around much more rapidly than _____ in the newspaper.
A.it
B.those
C.one
D.that
人体彩绘有东方版和()版之分。
A.古典
B.现代
C.西方
D.传统