A.0,test,true,true B.0,test,true,false C.1,test,1,2 D.1,truetest,2,1
A.ab B.rw C.r+ D.w+
A.Pragma>Cache-Control>Expires>ETag>Last-Modified B.Pragma>Expires>Cache-Control>ETag>Last-Modified C.Pragma>Cache-Control>Expires>Last-Modified>ETag D.Pragma>Cache-Control>ETag>Expires>Last-Modified
A.0 1 B.0 0 C.错误,因为B类继承A但变量x未被继承 D.错误,因为创建对象时,必须像Derived_Test一样传递参数(1)
A.class<’loop’> B.class<‘iteration’> C.class<’range’> D.class<’generator’>