问题
单项选择题
对于焊接前部件的组对坡口尺寸检查描述错误的是（）
A.允许偏差可以改动，特别是采用自动焊接时（可减少允许偏差）
B.机加工坡口内径的允许偏差：±0.25mm
C.建议的钝边允许偏差﹢0.5mm
D.内锥度≥10°
答案
参考答案：D
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对于焊接前部件的组对坡口尺寸检查描述错误的是（）
A.允许偏差可以改动，特别是采用自动焊接时（可减少允许偏差）
B.机加工坡口内径的允许偏差：±0.25mm
C.建议的钝边允许偏差﹢0.5mm
D.内锥度≥10°
参考答案：D
Mary parents buy everything their children want. If they go on(继续) doing so, the children won’t know that money 61 from hard work. When they grow up, they will waste(浪费) money but not 62 it. Some parents like having birthday parties 63 their children. If they go on doing so, the children will think they 64 enjoy birthday parties every year. They may forget their parents’ birthdays and only remember 65 . Many parents don’t let their children do chores. They think children have only one thing 66 . They should study hard 67 be good at their lessons. If parents go on doing so, children will think their parents should do 68 and won’t like cleaning the floor or the desk 69 they find a job. Parents should teach children to do chores because it can make them 70 and help them like work.
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