A.15kN
B.20kN
C.25kN
D.30kN
[单选题]图示结构杆1的轴力为( )。题37图A.0B.-PC.PD.-P/2
[单选题]图示为对称结构,则a杆的轴力为( )。A.受压B.受拉C.0D.无法确定
[单选题]图示桁架a杆轴力为:( )题23图A.15kNB.20kNC.25kND.30kN
[单选题]图示桁架l杆的轴力为( )。A.B.C.D.0
[单选题]图示BC杆轴力为( )。题22图A.-2FPB.C.D.-4FP
[单选题]图示桁架几根零杆?( )A.1B.3C.5D.7
[单选题]图示桁架a杆内力是( )。A.2PB.-2PC.-3PD.3P
[单选题]图示桁架a杆内力是( )。A.2PB.-2PC.-3PD.3P
[单选题]如图所示。桁架结构杆①的轴力为( )。题21图A.-2PB.-1.414PC.-PD.-P/2
[单选题]图示桁架有几根零杆?( )A.3B.9C.5D.6