【单选题】In a sand-casting mould, the‘core’is ( )
A.
a inset made from sand
B.
to form interior suces of the casting
【多选题】What's the process of sand casting?
【单选题】The preferred shape of runner in sand casting is
【单选题】Casting sand is expected to have ( )
【单选题】Sand casting pattern design should provide for ( )