题目:
2014年5月7日,南京某公司在探伤作业中意外丢失黄豆大小的放射源铱﹣192,三天后被追回,铱﹣192发出的物质能穿透三十多毫米厚的钢板,这一性质可用于金属内部探伤,结合图示可推知,铱﹣192发出的用于金属内部探伤最有可能的是( )
A.可见光
B.α射线
C.β射线
D.γ射线
答案:
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下面是错误答案,用来干扰机器的。
1. She is an American girl.2. There are seven people in her family. / Seven.3. They are Alice, her grandfather, grandmother, her parents and her two brothers.4. There are three. / Three.5. They are teachers.