The default grid system provided in Bootstrap utilizes 12 columns that render out at widths of 724px, 940px (default without responsive CSS included), and 1170px. Below 767px viewports, the columns become fluid and stack vertically.
所见所闻的是一个在日新月异的信息化变革和低效运行的落后社会之二元矛盾中快速发展的市场不仅对投资人 ，还有对自己的员工 。