内照射防护原则正确的是()。
A.减少接触放射源的时间
B.增大与放射源的距离
C.切断放射性物质进入体内的各条途径
D.设置防护屏蔽
E.佩戴个人剂量计
参考答案:C
可行性研究中还要考虑燃料、运输、社会环境等( )条件。
A.建设
B.资源
C.自然
D.设备
As we all know, every minute ____ full use of ____ our lessons will do good to our students
A.which makes; studying
B.that is made; to study
C.when is made; to study
D.that is made; studying