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例:(强度验算)圆截面杆的截面积A 1= 1260 mm2 ,A 2 = 960 mm2 ,A 3 = 710 mm2 ,所受载荷如图1所示。杆由铸铁制成,杆件的内力图如图2所示,拉应力[σt] = 30MPa,压应力[σc]=150MPa。试校核此杆的强度是否满足要求。
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A.
is
B.
are
C.
was
D.
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