There is a test tube containing a certain liquid on a horizontal table. When the mouth of the test tube is rotated from the position shown in the figure in the direction of the arrow, the liquid will

There is a test tube containing a certain liquid on a horizontal table. When the mouth of the test tube is rotated from the position shown in the figure in the direction of the arrow, the liquid will move against the bottom of the test tube.

According to p=ρgh, the density is the same, and the key is to compare the changes in depth. It can be seen from the figure: when the test tube rotates in the direction pointed by the arrow, the liquid depth first becomes larger, and reaches the maximum depth when it reaches the vertical direction, exceeding In the vertical direction, the depth of the liquid becomes smaller, so the pressure on the bottom first becomes larger and then smaller.

So choose D.