I went to school without ____ (eat) anything this morning.
汽油的热值是4.6×107J/kg,现有汽油500g,若燃烧一半,则剩余汽油的热值是____J/kg.
图是徐闻县的贺贺同学在探究学习活动中绘制的四幅正午日照图(分别选取不同季节的某一天测得),其中暑假期间绘制的是( )