紫外线灯进行物品消毒是，其有效距离为：（）
A、25-60cmA
暂无解析
英语翻译：telecommunications
The longest river in Canada is ________.
In the United Kingdom,police officers are not allowed to join ________ or to go on strike.
The vehicle was traveling at speeds ________ 90 miles per hour.
Please write a report _______ the above subjects are to be covered.
