无穷小量是

A、<strong><span style="font-size:14px;font-family:宋体">比</span><span style="font-size:14px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">0</span><span style="font-size:14px;font-family:宋体">稍大一点的一个数</span></strong>

B、<strong><span style="font-size:14px;font-family:宋体">一个很小很小的数</span></strong>

C、<strong><span style="font-size:14px;font-family:宋体">以</span><span style="font-size:14px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">0</span><span style="font-size:14px;font-family:宋体">为极限的一个变量</span></strong>

D、<strong><span style="font-size:14px;font-family:宋体">数</span><span style="font-size:14px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">0</span></strong>