A.不應(yīng)小于總截面面積的5% B.不應(yīng)小于總截面面積的3% C.不應(yīng)大于總截面面積的5% D.不應(yīng)大于總截面面積的3%
A.不應(yīng)大于80MPa B.不應(yīng)大于60MPa C.不應(yīng)小于60MPa D.不應(yīng)小于80MPa
A.45° B.180° C.90° D.120°