防止冷裂纹的措施中不包含()
A.清理坡口及两侧的油、水、锈
B.采用碱性低氢型焊条焊接
C.焊前预热、焊后热处理
D.控制焊缝中硫、磷、碳的含量
参考答案:D
To make sure that relics in he museum are well preserved, Tibet's cultural preservation
institutions have ________ modern technologies to monitor the conditions of the relics. [ ]
A. adapted
B. applied
C. appointed
D. abolished
根据我国GB/T19000质量管理体系标准的规定,凡工程产品没有满足某个规定的要求,就称之为()。
A.质量缺陷
B.质量问题
C.质量不合格
D.质量事故