万能寿险的非约束性是指分别计算()。
A.保单现金价值和保险金额
B.纯保费和附加保费
C.保险费和保单的现金价值
D.保险费和保险金额
参考答案：A
若（x2+px+q）（x2-2x-3）展开后不含x2，x3项，求p、q的值．
Which of the following statements about object oriented database is NOT correct
A．Each object has a unique object identity in the system
B．Encapsulation and inheritance are two important features of object oriented database
C．A subclass can inherit the attributes and methods of all its superclasses
D．A superclass includes the attributes and methods of all its subclasses
