蛋白质药物的冷冻干燥注射剂中最常用的填充剂是 （ ）
A．甘露醇
B．氨基酸
C．淀粉
D．氯化钠
E．十二烷基硫酸钠
参考答案：A
Convection spreads a fire by（）.
A.heated gases flowing through ventilation syetem
B.the transfer of heat across an unobstructed space
C.burning liquids flowing into another space
D.transmitting the heat of a fire through the ships metal
分配器中有哪些配件？
