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【单选题】
圆筒形容器工作压力为2MPa,壳体内径为1000mm,壁20mm,则圆筒形壳体截面上的应力、环向应力值是( )。
A.
255MPa、51MPa
B.
25MPa、50MPa
C.
51MPa、255MPa
D.
50MPa、25MPa
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