由低分子药物分散在分散介质中形成的液体制剂，分散微粒小于1nm( )。
A．低分子溶液剂B．高分子溶液剂C．乳剂D．溶胶剂E．混悬剂
参考答案：A
raining hard for 3 hours without stopping.
A．It is
B．It was
C．It has been
D．It had been
( )沉井壁按截面形状上下井壁厚度是相同的。
A．矩形B．柱形C．阶梯形D．圆形
