下列不属于电离辐射的是Which of the following is not ionizing radiation? 选项:
A:电脑产生的辐射Radiation generated by computers; B:手机产生的辐射Radiation generated by mobilephone; C:DR产生的辐射Radiation generated by DR; D:CT产生的辐射Radiation generated by CT; E:PET产生的辐射Radiation generated by PET