1, the weight is known, and the degree is known.

There is no other way to identify mistakes except experiments.

3. Science is the commander and practice is the soldier.

4. Good scholars try their best, but good doers find it difficult.

5. It is better to see hearsay than to see shadows.

6. The knower is not as good as the walker.

Experiment is the father of science. Chemistry laboratory:

1. Everyone has to admit that experiment is the father of science.

2. All reasoning must come from observation and experiment.

3. It is better to listen than to watch, and practice than to watch.

4. At the end of the article, I felt shallow and didn't know it needed to be done.

5. Explore, know and understand

I sit here and watch a fisherman throw like a fish. Biology laboratory:

1, hearing is not as good as vision, and vision is not as good as experiment.

2, empty talk, it is better to try it easily.

3. Feeling will not deceive people, but judgment will deceive people.

4. Bold exploration and repeated experiments.

5, careful observation, careful analysis, scientific summary.

6. It must be stupid not to practice anything.

Chemical laboratory safety song

Fire and water are ruthless, life concerns the sky, safety comes first, and mind your own heart.

One is waterproof, the other is fireproof, the third is explosion-proof and the fourth is electric shock prevention.

Before the experiment, be prepared and have all kinds of protective equipment.

During the experiment, don't leave without permission, observe in time to prevent variation.

Leave for a short time and be looked after by peers, especially when water and electricity are cut off.

Overnight heating is the most dangerous. If you really need it, you need five risks:

Voltage regulation and transformation, using relay and silicone oil hot compress as heat source.

No reflux, no cold water, constant temperature can make you sleep well.

Pay attention to water, connect the water pipes tightly, and don't use too much water. Unplug the pipe after work.

When using electrical appliances, check the wires first to prevent short circuit and leakage.

Use gas carefully, ignite it carefully, and stay away from solvents and experiments.

Open flame heating, ventilation first. High-pressure gas cylinders, put them away steadily.

Hydrogen cylinders should be operated strictly. Household refrigerators are not suitable for experiments.

The container in the box must be tightly covered, placed stably and labeled.

Toxic reagents, collected by special personnel, metal potassium and sodium, are stored in special places.

Don't store too much solvent in the shade, and enter the secluded place in summer.

Residue and waste liquid shall not enter the pool, and shall be put back in its original place by classification.

Keep the laboratory clean, do not eat or smoke.

Finally, leaving the room is the key, and the water and electricity shutters and brake pins are restored.

Fire-fighting equipment, regular inspection and first-aid medicines are always at hand.

In case of danger, cut off the power supply first, and alarm signals can be seen everywhere.

After this song, practice hard, be bold and cautious, and be safe forever.

On balance, we know its importance.

After consideration, we know that this is a shortcoming.

There is no other way to identify mistakes except experiments.

Only experiments can distinguish mistakes.

3. Science is the commander and practice is the soldier.

Science is the commander and practice is the soldier.

4. Good scholars try their best, but good doers find it difficult.

Find out how to learn well and how to go further.

5. It is better to see hearsay than to see shadows.

Seeing is better than hearing, and investing is better than seeing.

6. The knower is not as good as the walker.

Better said than done.

7. Experiment is the father of science.

Experiment is the father of science.

1. Everyone has to admit that experiment is the father of science.

Everyone agrees that experiment is the father of science.

2. All reasoning must come from observation and experiment.

All reasons must come from observation and experiment.

3. It is better to listen than to watch, and practice than to watch.

Seeing is better than hearing, and practice is the best.

4. At the end of the article, I felt shallow and didn't know it needed to be done.

One should not believe everything around him, but the truth in books.

5. Explore, know and understand

Explore the truth and seek knowledge, and you will understand why.

I sit here and watch a fisherman throw like a fish.

Onlookers-people will not experience the happiness of onlookers.

1, hearing is not as good as vision, and vision is not as good as experiment.

There is nothing better than an experiment.

2, empty talk, it is better to try it easily.

Trying is more effective than empty talk.

3. Feeling will not deceive people, but judgment will deceive people.

Feelings are not always right, but judgments are sometimes right.

4. Bold exploration and repeated experiments.

Explore bravely and do experiments repeatedly.

5, careful observation, careful analysis, scientific summary.

Careful observation, careful analysis and scientific summary.

6. It must be stupid not to practice anything.

Without practice, everything proves to be a failure 1, chemistry is ever-changing, and experiments follow the law to explore; 2. Correct operation and careful observation; 3. Use your hands and brain to explore the law; 4. Cultivate scientific attitude and improve scientific quality; 5. Use your hands and brains, be thirsty for knowledge and be good at thinking; 6. Learn scientific knowledge and climb the peak of science and technology; 7, bold reform, realistic and innovative; 8. Explore the mysteries of life and improve the quality of life; 9, independent thinking, unity and cooperation; 10, chemistry improves the living environment, and * * * enjoys the green world; Science and technology create a better life and build a harmonious home. +0 1. It is often more important to raise a problem than to solve it; 12, all reasoning must come from observation and experiment;

13, hearing is not as good as vision, and vision is not as good as experiment; 14, everyone has to admit that experiment is the father of science; 15, science is the commander in chief, and practice is the soldier;