下列哪一种生物制品可做为乙型肝炎人工被动免疫
A．抗毒素B．丙种球蛋白C．胎盘球蛋白D．乙型肝炎疫苗E．特异高价免疫丙种球蛋白
参考答案：E
The new CEO asked that all inter-office communications ______ in writing rather than in person, ______ possible.
A．have been made; whoever
B．would be made; whichever
C．be made; whenever
D．were made; whatever
光谱特征向量
