單項(xiàng)選擇題牌號Q390、外徑50mm、壁厚5mm鋼管比例試樣,抗拉荷載實(shí)測值為198.5kN,計(jì)算可得抗拉強(qiáng)度為()

A.489.80MPa
B.489.76MPa
C.490.12MPa
D.490MPa


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