AB杆变形如图中虚线所示，则A端的杆端弯矩为()
A.MAB＝4iφA－2iφB－6iΔAB/l B.MAB＝4iφA＋2iφB＋6iΔAB/l C.MAB＝－4iφA＋2iφB－6iΔAB/l D.MAB＝－4iφA－2iφB＋6iΔAB/l正确答案C
AB杆变形如图中虚线所示，则A端的杆端弯矩为()
A.MAB＝4iφA－2iφB－6iΔAB/l B.MAB＝4iφA＋2iφB＋6iΔAB/l C.MAB＝－4iφA＋2iφB－6iΔAB/l D.MAB＝－4iφA－2iφB＋6iΔAB/l正确答案C
