單項(xiàng)選擇題

圖示鉸結(jié)排架,如略去桿件的軸向變形,當(dāng)A點(diǎn)發(fā)生單位水平位移時,則P的大小為:()

A.6(EI/h3
B.12(EI/h3
C.24(EI/h3
D.48(EI/h3