15. Shell molding is best described by which one of the following:
(A) casting operation in which the
molten metal has been poured out after a thin shell has been solidified in the mold,
(B) casting process
in which the mold is a thin shell of sand bonded by a thermosetting resin,
(C) sand casting operation in
which the pattern is a shell rather than a solid form,
(D) casting operation used to make artificial sea
shells,
(E) none of the above?
阿摩線上測驗
登入