(2ee9？ Taian) In the experiment of "Weighing the mass of an object with a balance", Zhang Qiang used the adjusted balance to weigh the mass of the object by increasing or decreasing the weight.

(1) moving the balance nut and other beams can only be done during the adjustment of the balance, and the balance nut cannot be moved again during the weighing of the object.

(2) When weighing an object with the adjusted balance, the pointer deviates to the left of the center line of the dial at 2 o'clock, indicating that the left end sinks at 2 o'clock. If the minimum weight is added, the end will sink and only the direction will move.

So choose D.