医疗机构具有保存冷冻尸体条件时，需要尸检，最长保存时间为（）

单项选择题In this section, you will have 10 sentences. Read the four choices after each sentence and choose the right answer to complete the sentence.This program will _____ everyone. A、beneficial B、benefit C、benefits D、benefited

单项选择题热解吸-气相色谱法测定室内空气中总挥发性有机物，吸附采样管解吸时的温度应控制在( )℃。