单选题:Look at that little boy wandering about--perhaps his mother 题目分类:中学英语 题目类型:单选题 查看权限:VIP 题目内容: Look at that little boy wandering about--perhaps his mother__________. A.will lose B.is losing C.had lost D.has lost 参考答案: 答案解析:
在致密性试验的种类中,( )适用于焊缝另一侧被封闭的场所。 在致密性试验的种类中,( )适用于焊缝另一侧被封闭的场所。A.氦气试验 B.真空箱试验 C.煤油试漏 D.气密性试验 分类:中学英语 题型:单选题 查看答案