comparison是可数名词吗

comparison不是可数名词，例如：

1、I enclose the two plans for comparison.兹附上两份计划以供比较。

2、Comparison with other oil-producing countries is extremely interesting.与其他石油生产国作一比较是很有意思的。

3、The comparison shows considerable disagreement between theory and practice.这一对比表明理论和实践之间有相当大的出入。