A.氣泡B.白點C.發(fā)紋D.氫脆
A.先凝固的溶質(zhì)濃度低B.后凝固的溶質(zhì)濃度低C.先凝固的溶質(zhì)濃度高D.后凝固的溶質(zhì)濃度高
A.自發(fā)形核B.非自發(fā)形核C.均質(zhì)形核D.非均質(zhì)形核
