商场在汽车的____方向

在“探究液体内部的压强与哪些因素有关”的实验中，小明同学在塑料管上离管底等高的不同位置A、B、C处扎了三个小孔，并将其放入水槽中，如图所示．

①水通过三个小孔流入塑料管中，说明水内部向各个 ____都有压强．

②若小明改变塑料管在水中的深度，他想探究水内部的压强与 ____的关系．

③若小明还想探究液体内部的压强与液体种类的关系，还需要用 ____进行多次实验．

    Tom is seven . He goes to school every day .The school is near his home , so he goes there on foot and comes back home on time . But today he is late .his mother asks his , “Why are you late today?”“I am in the headmasters office?”“Why do you go the headmaster's office?”“Because my teacher asks us a question in the class , nobody (没人)can answer(回答)it , but I can .“It's good to answer the teacher's question.”“But the question is who pus ink on my chair.”