There are two U-tube manometers fixed on the fluid R3=50 mm. Try to calculate the pressure at point Aand the manometer is filled with the water to prevent from U-tube manometers are R1=400 mm，R2=50 mm, bed reactor, as shown in the figure. The readings of two respectively. The indicating liquid is mercury. The top of the mercury vapor diffusing into the air, and the height B.
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