When performing adult chest compressions during CPR, what are the standardized compression location, depth, and frequency according to national first aid guidelines?

1. Center of the chest (lower half of the sternum / 胸骨中下段), compression depth of 5 to 6 cm, and frequency of 100 to 120 compressions per minute with complete chest recoil
2. Upper left abdomen over the stomach, depth of 1 cm, frequency of 40 compressions per minute
3. Directly over the throat, depth of 10 cm, frequency of 200 compressions per minute
4. Over the left shoulder blade, depth of 2 cm, frequency of 60 compressions per minute