焊接人员要有焊工安全操作证,还应有焊接压力容器()。A.施工证书 B.资质证书 C. 发布时间:2019-12-09 00:52 │ 来源:www.tikuol.com 题型:单项选择题 问题: 焊接人员要有焊工安全操作证,还应有焊接压力容器()。A.施工证书B.资质证书C.施焊证书D.资格证书
题型:单项选择题 ---When did he meet his wife for the first time?---It was _________ he came back from Africa that year _________ he met his wife.A.when; thenB.not until; thatC.not; untilD.only; when 查看答案