动叶的进口高度等于（）
A.本级静叶高度
B.本级静叶高度加盖度
C.上级动叶出口高度
D.下级静叶高度
参考答案：B
制备脂质体常用的材料是
A．聚乙烯吡咯烷酮B．乙基纤维素C．β-环糊精D．磷脂和胆固醇E．聚乳酸
The central processing unit(CPU), sometimes referred to as the processor, interprets(解释)and carries out the basic (71) that operate a computer.
A．database
B．files
C．block
D．instructions
