What are symmetrical objects in daily life?
1, opposite the door
Opposite door is also called double door, and opposite door refers to a door with two doors. Generally, when the doorway is wide, doors are designed in pairs for convenience and beauty.
One door leaf is equipped with a lock, and the other door leaf is equipped with a fake lock and a bolt.
2. Pliers
Pliers are hand tools used to clamp and fix workpieces or twist, bend and cut metal wires. Pliers are V-shaped and usually include three parts: handle, jaw and mouth.
Pliers are generally made of carbon structural steel. They are first forged and rolled into the shape of pliers blanks, then processed by metal cutting such as grinding, milling and polishing, and finally heat treated.
3. scissors
Scissors (Ji m 4 n d ā o) is a double-edged tool, which is used to cut sheet or linear objects such as cloth, paper, steel plate, rope and round steel. The two sides are staggered and can be opened and closed. In China, due to the development of textile industry, there is a difference between scissors and scissors industry.
If scissors are a knife, they are called scissors. It is shaped like a folded iron column with a knife at its tip. It is often used in embroidery. Now influenced by foreign culture, it is called u-shaped scissors.
4. glasses
It is a kind of glasses for correcting eyesight, which enables people to see distant objects clearly. The purpose is to keep the ciliary muscle of the eyeball in a certain regulatory capacity.
A complete pair of frame glasses usually consists of lens, lens ring, nose rest, pile head and lens foot. In addition to the above components, there are foot covers, blade screws, hinge screws and so on.
Step 5: ladder
Ladder, a daily appliance, consists of two long and thick poles with a cross bar suitable for climbing in the middle for climbing.