(来学网)铸造蜡的热膨胀率在20~30℃时为
  • A.
    (来学网)小于0.3%~0.6%
  • B.
    (来学网)小于1%
  • C.
    (来学网)大于0.3%~0.6%
  • D.
    (来学网)大于1%
  • E.
    (来学网)以上均不对