A、<span style="font-size: 16px; line-height: 18.88888931274414px; font-family: 宋体;">可以用</span><span style="font-size: 16px; line-height: 18.88888931274414px;">REC</span><span style="font-size: 16px; line-height: 18.88888931274414px; font-family: 宋体;">定义结构体变量</span>
B、<span style="font-size: 16px; line-height: 18.88888931274414px;">REC1</span><span style="font-size: 16px; line-height: 18.88888931274414px; font-family: 宋体;">是</span><span style="font-size: 16px; line-height: 18.88888931274414px;">struct REC</span><span style="font-size: 16px; line-height: 18.88888931274414px; font-family: 宋体;">类型的变量</span>
C、<span style="font-size: 16px; line-height: 18.88888931274414px;">REC</span><span style="font-size: 16px; line-height: 18.88888931274414px; font-family: 宋体;">是</span><span style="font-size: 16px; line-height: 18.88888931274414px;">struct</span><span style="font-size: 16px; line-height: 18.88888931274414px; font-family: 宋体;">类型的变量</span>
D、<span style="font-size: 16px; line-height: 18.88888931274414px; font-family: 宋体;">可以用</span><span style="font-size: 16px; line-height: 18.88888931274414px;">REC1</span><span style="font-size: 16px; line-height: 18.88888931274414px; font-family: 宋体;">定义结构体变量</span>
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