未知题型 In most cases politicians are______as they seldom tell the truth.A.credibleB.incredulousC.credulousD.incredible

单项选择题 某项目现有三个互斥的投资方案A、B、C，欲从中选择最有利的方案，一个投资方案的投资额及一年后的净收益如下表所示。各方案的寿命期都是一年，一年后的净残值为零。C方案的净现值为( )万元。

未知题型 According to the passage, which is Not True of surveys via the Web?A.They reduce the cost involved in data collection.B.They are secure and easy-to-use in collecting datA.C.They provide more convincing conclusions on the matter surveyeD.D.They face fierce competitions from the traditional survey methods.