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图示简单桁架，杆1和杆2的横截面面积均为A，应力均为[ó]，设N1、N2分别表示杆1和杆2的轴力，a+β=90度，则在下列结论中，正确的是()。A.
载荷P=N1cosa+N2cosβ
B.
N1sina=N2sinβ
C.
许可载荷[P]=[ó]A(cosa+cosβ)
D.
许可载荷[P]≤[ó]A(cosa+cosβ)
E.
许可载荷[P]≥[ó]A(cosa+cosβ)
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