A、<p><span style="font-family: 微软雅黑, 'Microsoft YaHei';">无穷大量</span><br></p>
B、<p><span style="font-family: 微软雅黑, 'Microsoft YaHei';">无穷小量</span><br></p>
C、<p><span style="font-family: 微软雅黑, 'Microsoft YaHei';">无界变量</span><br></p>
D、<p><span style="font-family: 微软雅黑, 'Microsoft YaHei';">有界变量</span><br></p>