A note was on the blackboard ______ “All those who have a fever must leave school right now”.
A:on which was written
B:said
C:read
D:reading
下面是某化学反应的微观模型示意图,据此分析错误的是 ( )
某县一天中午的温度是15℃,夜间九点下降了17℃,则这天夜间九点的温度是( )
阅读漫画,回答问题。
方程|4x-8|+x-y-m=0,当y>0时,m的取值范围是( )