设A（An）为构件的毛（净）面积，φ为受压构件的稳定系数。钢实腹式轴心受压构件的整体稳定性应按（　　）公式计算。

A、<img border="0" width="45" height="27" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-29/35809659-59ef-476f-aade-8f34f407f916.png" />

B、<img border="0" width="44" height="28" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-29/556fa4ec-4394-44ea-80e8-1835ae239e75.png" />

C、<img border="0" width="45" height="26" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-29/87a17df5-47dd-4302-8122-9ed16aadf74f.png" />

D、<img border="0" width="43" height="26" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-29/4fc4afc0-f070-4052-a361-f3db737b58eb.png" />