最易引起输血后肝炎的病毒是
A．HDV
B．HAV
C．HCV
D．HBV
E．HEV
参考答案：C
—Let's go to the zoo on Saturday!
—_____. [ ]
A. Excuse me
B. Good idea!
C. You're welcome
D. It doesn't matter
最优化生产技术的英文简称为______。
A．VSLI
B．OPT
C．ERP
D．MRPⅡ
