成本效果比指
A．ICERB．健康效用值C．健康效果D．每增加一个单位的效果所增加的成本E．每产生一个单位效果的成本
参考答案：E
The MCA Youth has expected more participants to join the trip to the Expo 2010 Shanghai ________ from May1 to October31 this year to explore the world.
A．being held
B．to be held
C．having been held
D．held
软件的可维护性包括
A．正确性、灵活性和可移植性
B．可测试性、可理解性和可修改性
C．可靠性、可复用性和可用性
D．灵活性、可靠性和高效性
