The answer is A because:
When the piston in the sprayer is pushed, the air is compressed and moves quickly through point A. This region experiences a rapid airflow (i.e., increased air velocity). According to Bernoulli's principle, as the air velocity increases, the air pressure decreases. Therefore, at point A, where the airflow is fastest, the air pressure is the lowest.
In summary: Point A has the highest airflow speed, which results in the lowest pressure, so the correct answer is A.
这道题的答案是 A 的原因是：
当图中喷雾器的活塞（ombor）被推压时，空气被压缩并快速通过A位置，这个区域会产生一个快速气流（即空气流动速度增加）。根据伯努利原理，当气流速度增加时，气压会降低。因此，在A点处，气流的速度最大，导致空气压力是所有点中最低的。
总结：由于A点的空气流速较高，因此压力最小，所以选项为A。
