A large bubble appeared in the night sky of the United States, and there was a ring in the middle of

This is supposed to be a natural phenomenon, because the temperature rises, and then the gas rises like this.

This is supposed to be an atmospheric bubble, transparent and quite good-looking, it may be a signal of aliens.

Maybe it's just a peculiar environmental landscape, and there should be no problem.

Actually, it's just a natural landscape, and it's not that strange.

I think it was due to the special weather at that time.

This is a phenomenon caused by the natural environment, which is not very strange.

I think it must have something to do with some local climate and environment, which is why this happens.

I think it's just a refraction of light, that's why it's like this.

This thing is their help, a situation, so there is nothing more.

I think this should be man-made, and this should not be a natural cause.

B square glass bricks, in which there is a spherical large bubble, which is thick at the edge and thin in the middle, is equivalent to a piece of concave ytterbium. Therefore, the image is reduced and upright, and the myopic glasses are concave ytterbium, you can try it.

Can you put ** on it?

The answer is b.

Equivalent to two concave mirrors.

It's equivalent to a convex lens, and the air bubble in the middle is a lens.

Air is a photophobic medium relative to glass, and the hollow bubbles make the glass form a concave lens, and when you look at an object, it will become an upright and shrinking virtual image.

If it's just a spherical glass sphere, you can see a magnified virtual image, and vice versa if it's a minimized virtual image.

Process problems during production.

1. Whether the working pressure of the dissolved gas tank is appropriate, in order to increase the amount of dissolved gas, the working pressure of the dissolved gas tank is higher, generally. 2. If there is a large pressure drop between the dissolved gas tank and the releaser, the pressure gauge can be added at the end of the main pipe of the dissolved gas trap.

to be sure. 3. The disappearance time of the bubble should be greater than 4min Measuring instrument: a measuring cylinder with a range of 1000ml.

One, a stopwatch opens the dissolved air tank container water sampling valve, takes the dissolved air water and injects it into the graduated cylinder to 1000ml, and at the same time uses a stopwatch to record the time when the bubbles begin to disappear to the time when the bubbles disappear completely. 4. You can refer to the technical requirements of the pressure mu only dissolved air flotation device, which can be searched.

Check the venting of the mold. The appearance of air bubbles is generally caused by poor venting of the mold.

It could be that your screen hasn't been wiped clean. Another possibility is that the surface of the phone or the membrane itself is uneven. Another possibility is that the adhesive on the inner surface of the membrane is not good, and there are some volatile gases gathered in it. Or the phone screen is pressed and the surface is uneven.

Use a blade to make a small opening in the bubble to release the gas, and then press and paste it.

The presence of air bubbles in the lungs is the condition of the alveoli, which is due to the decline of alveolar function, the increase of residual air volume, the increase in the volume of alveoli, the formation of emphysema, and the rupture of the alveoli to form a bullae, such alveoli do not have gas exchange function. For the case of pulmonary bullae, it will not disappear on its own, but will only stabilize at this stage, and it is rare when the pulmonary bullae are small, and there will be chest tightness after they are large. It is recommended to go to the hospital for a check-up**.

Hello, according to what you said, it is considered that the patient may have a spontaneous pneumothorax and need surgery**.

Do not engage in strenuous activities. Some people have congenital pulmonary bullae, and my dad is breathing well, and sometimes he coughs when he is older, and there will be medication ***.