题目内容
铸件上常出现金属小结的原因是
2021-11-10
A.包埋材料透气性差
B.包埋材料调得过稠
C.包埋时未完全包埋蜡型
D.包埋材料调得过稀
E.包埋材料中气泡未排尽
试卷相关题目
SQL Error: select id,body,options from ***_enewstiku where sourceid='27672' and id < 2278876 and id<>'2278876' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27672' and id > 2278876 and id<>'2278876' order by id asc limit 5