下列物质属于纯净物的是 请选择DCBA*N9V9g-w+r8~*U4b8q-f:R/\/_+B2q,G'g0I,c'E*[*J8U
A./_+B2q,G'g0I,c'E*[*J8U
B./_+B2q,G'g0I,c'E*[*J8U
C./_+B2q,G'g0I,c'E*[*J8U
D./_+B2q,G'g0I,c'E*[*J8U