Băng kép hoạt động dựa trên hiện tượng vật lý nào?

băng kép được làm bằng đồng-thép đang thẳng. sau khi hơ nóng(hoặc làm lạnh) thì băng kép này sẽ bị cong về phía bên nào

SBT = ST + hiệu

số bị trừ là:

630 : 2 = 315

số trừ là:

315 : (4+1) = 63

hiệu là:

315 - 63 = 252

phép trừ đó là : 315 - 63 = 252

6  kg nhe ban

192 m2 gyggggggggggggggggg

101/50

In my country, spring is the best season of the year because it has Tet holiday. In Tet holiday, the streets are very beautiful with green trees , flowers, and funny noisy. In every house, there are a big tree with many love flowers and plants. Any things else? Yes, there are a lot of delicous drinks, cakes and candies. In Tet holiday, children have money from adults. It's so greet. We enjoy a happy Tet holiday every years. Do you know out happy holiday in spring? It's Tet holiday. What about you? Can you tell me about your country 's best holiday? Thank you so much.

Bài văn ngắn gọn:

Tet is a national and family festival. It is an occasion for every Vietnamese to have a good time while thinking about the last year and the next year. At Tet, spring fairs are organized, streets and public buildings are brightly decorated and almost all shops are crowded with people shopping for Tet. At home, every is tidied, special food is cooked,offerings of food, fresh water, flowers and betel are made on the family altar with burning joss- sticks scenting the air. First-footing is made when the lucky visitor comes and children are given lucky money wrapped in a red tiny envelope. Tet is also a time for peace and love. During Tet, children often behave well and friends, relatives and neighbors give each other best wishes for the new year.

CHÚC BẠN HỌC TỐT

tren 1 con duong thang mot chu rua va 1 chu tho o cung vi tri rua va tho xuat phat nguoc nhau vao cung 1 thoi diem sau 30 phut chu rua di duoc 1 quang duong la 21 m chu tho thi chay 1 quang duong duong la 68m hoi sau 30 phut thi rua va tho cach nhau bao xa

Có 9 hòn bi đặc và rỗng(trong đó có 8 hòn bi đặc và 1 hòn bi rỗng) Trình bày cách xác định hòn bi rỗng với 2 lần cân robecvan.