1) What is a gear? a) a type of wheel with a teeth b) a ball that rolls c) a flat piece of wood d) a type of rope 2) what happens when two gears are connected? a) they spin in the same direction b) they don't move c) they spin in opposite direction d) they break apart 3) why are gears important in machines? a) they help machines work faster and easier b) they make machines heavier c) they make machines slower d) they stop machines from working

Bảng xếp hạng

Phong cách trực quan

Tùy chọn

Chuyển đổi mẫu

Bạn có muốn khôi phục tự động lưu: không?