面向对象_4-5选择题

选项ABCD都为Grade1的子类,能正确输出‘we have 20 students’选项是()(选择两项)

//climg.mukewang.com/598bf9b3000180c904360157.jpg

A

//climg.mukewang.com/598bf9cc0001443003960159.jpg

 
B

//climg.mukewang.com/598bf9f300018b3503610188.jpg

C

//climg.mukewang.com/598bfa070001b75f03230165.jpg

D

//climg.mukewang.com/598bf9e0000122f703620213.jpg

CD
原文地址:https://www.cnblogs.com/kay-learning/p/8965459.html