【单选题】p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; text-align: justify; font: 14.0px 'PingFang SC'; color: #000000; -webkit-text-stroke: #000000}span.s1 {font-kerning: none}span.s2 {font: 14.0px 'Times New Roman'...
A.
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; text-align: justify; font: 14.0px 'Times New Roman'; color: #000000; -webkit-text-stroke: #000000}span.s1 {font-kerning: none} CaO
B.
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; text-align: justify; font: 14.0px 'Times New Roman'; color: #000000; -webkit-text-stroke: #000000}span.s1 {font-kerning: none} BaO
C.
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; text-align: justify; font: 14.0px 'Times New Roman'; color: #000000; -webkit-text-stroke: #000000}span.s1 {font-kerning: none} MgO
D.
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; text-align: justify; font: 14.0px 'Times New Roman'; color: #000000; -webkit-text-stroke: #000000}span.s1 {font-kerning: none} BeO