【单选题】17 / 250立杆轴力基本组合公式为?AN=1.2NGk+1.4NQkN = 1.2N_{Gk} + 1.4N_{Qk}N=1.2NGk+1.4NQk正确BN=NGk+NQkN = N_{Gk} + N_{Qk}N=NGk+NQkCN=1.4NGk+1.2NQkN = 1.4N_{Gk} + 1.2N_{Qk}N=1.4NGk+1.2NQkDN=1.2NQk+1.4NGkN = 1.2N_{Qk} + 1.4N_{Gk}N=1.2NQk+1.4NGk参考答案A参考解析N=1.2NGk+1.4NQk。