There's an 1 tree behind the Crisps' house. Jack Crisp is standing near the tree. There are some apples on the tree. Jack is looking 2 the apples. They are big and red

    Jack is 3. He wants to eat an apple. Jack isn't tall. He can't reach the apples. He is putting a box under the tree. Can he reach the apples now? No, he can't. He is too short.

    Here comes Paul Crisp. He is Jack's 4, "Hey, Jack! What are you doing?"

"Please help me? I can't reach the apples."

    Paul picks up 5 apples and says, "Here you are, Jack. One for you, and one for me!"

    "Thank you, brother."

如图所示的试管内装一定量的水，当试管竖直放置时，水对管底的压强为P₁；当管倾斜放置时，水对管底的压强为P₂，比较P₁、P₂的大小，则（   ）