单项选择题
A.1.5V,220V B.1.5V,380V C.36V,220V D.36V,380V
A.3.14 B.314 C.abc D.123
A.int a=0;b=0;c; B.int a=0,b=0,c=0; C.int a; D.int a=0,b=0;