中药浓缩液直接制粒的方法是（）
A.挤出制粒
B.高速搅拌制粒
C.喷雾干燥制粒
D.滚转法制粒
E.干法制粒
参考答案：C
It has been three months ________the famous painting was stolen. [ ]
A．before
B．since
C．until
D．unless
1mol OH-的质量是17g。
