Bôi trơn ổ lăn được thực hiện như thế nào? Khi nào ta cần sử dụng đĩa chắn dầu hoặc vòng chắn dầu

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

hope this !

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers