(来学网)加热熔解的石蜡在冷却过程中体积可缩小
  • A.
    (来学网)1%~5%
  • B.
    (来学网)5%~10%
  • C.
    (来学网)10%~20%
  • D.
    (来学网)20%~30%
  • E.
    (来学网)30%~40%