(20 14? The Chinese aircraft carrier "Liaoning" went to sea for trial. The aircraft carrier "Liaoning" was buoyed when it was sailing on calm water.

(1)∵ The aircraft carrier is floating when sailing on calm water.

∴ The buoyancy it receives is equal to its total gravity;

(2) After the fighter plane takes off from the aircraft carrier, the total gravity of the aircraft carrier decreases.

The gravity of a floating object is equal to its own gravity,

At this point, the buoyancy of the aircraft carrier ∴ will be reduced.

∫F float =ρgV row，

When the carrier aircraft on the aircraft carrier takes off, the volume of boiling water will decrease.

(3) When the ships are running side by side, the ships will drive the surrounding water along with the ships, so that the water flow speed inside the ships is higher than that outside the ships; Because the greater the current speed, the smaller the pressure, the smaller the current speed and the greater the pressure, so there is a pressure difference between the water measured inside and outside the ship, which makes the ship approach and then collide. In order to avoid accidents, "shoulder to shoulder" escort is not adopted.

(4) When the submarine dives:

∫p =ρGH, the depth h becomes larger,

The pressure of water has increased.

So the answer is: equal to; Reduce; ? Fast; ? Small; Get bigger.