用托盘天平称量一粒黄豆的质量，下列方法中可取的是（　　）

    Hello. My name is Lin Tao. I am a boy. I am a student. There are three people in my family. My father is a tall man. His name is Lin Liang. He is a doctor. My mother is a short woman. Her name is Wang Hong. She is a teacher. I love my father and my mother. My father and my mother love me, too. We are a happy family.

如图所示是小明自制的简易温度计．在空玻璃瓶内插入一根两端开口、内横截面积为0.4cm²的玻璃管，玻璃瓶与玻璃管接口处用蜡密封，整个装置水平放置．玻璃管内有一段长度可忽略不计的水银柱，当大气压为1.0×10⁵P，气温为7℃时，水银柱刚好位于瓶口位置，此时封闭气体体积为480cm³，瓶口外玻璃管有效长度为48cm．求：

①此温度计能测量的最高气温；

②当气温从7℃缓慢上升到最高气温的过程中，密封气体吸收的热量为3J，则在这一过程中密封气体的内能变化了多少．