单项选择题
A.3.0*6.0,3.0,6.0; B.3.5*6.5,3.5,6.5; C.4.0*8.0,4.0,8.0; D.4.5*8.5,4.5,8.5;
A.1.5; B.2.0; C.2.5; D.3.0;
A.1.0; B.1.2; C.1.5; D.1.8;