天然辐射源包括() A.宇宙射线(初级射线与次级射线引起的外照射) B.核技术应用 发布时间:2017-06-13 13:37 │ 来源:www.tikuol.com 题型:多项选择题 问题: 天然辐射源包括()A.宇宙射线(初级射线与次级射线引起的外照射)B.核技术应用C.核事故D.电离辐射在医学诊断和治疗中的应用E.天然放射性核素(内照射与外照射)
题型:多项选择题 Nick is my pen pal. He is 12 years old. He is from Canada. He lives in Ottawa. He speaks English and French. He likes science best. He likes Chinese, too. And he says he can speak a little Chinese, but he can’t write in Chinese. Nick likes sports, too. He likes swimming best He goes swimming on weekends with his father. He says he can swim very well. He doesn’t like Physics. He thinks it too difficult. Nick has a big family. There are eight people in his family, his grandpa, grandma, father, mother and his brothers and sisters. He has two brothers and two sisters. They are Bob, Tim, Jane and Susan. They are happy!Name: NickAge:小题1:___ From: 小题2:_____________Language(s): 小题3:__________ Subject he likes best: 小题4:____________Sport he likes best: 小题5:_______________ 查看答案
题型:多项选择题 在设计和制作冠内附着体时,为了确保冠内附着体栓道的各轴壁之间的共同就位道,应严格遵循()。A.在平行研磨仪上进行操作 B.在模型观测台上操作 C.应用转移杆 D.垂直分析杆 E.目测 查看答案