对于人工被动免疫,免疫作用通常可持续()
A.2~3小时
B.2~3天
C.2~3周
D.6个月
E.12个月
参考答案:C
There is free firewall software available that can run on minimal hardware and provide a good level of (71) to your network.
A.protective
B.profecting
C.protection
D.profection
影响速动比率可信性的重要因素是存货的变现能力。 ( )