vì nó có mực

Trả lời : Vì bút bi có ngòi bên trong là mực nên nó phải viết ra mực chứ .

#Thiên_Hy

Hok_Tốt

Trả lời lại đi bạn
 

vì trước kia một số cây bút xưa dùng rất bất tiện 

- Bút lông của châu Âu viết rất nhanh hết mưc.

- bút sậy viết rất dễ gãy ngòi khi ấn mạnh và còn dây mực.

ngày 25 tháng 5 năm 1827 Pertrache Poenaru đã sáng chế ra bút mực để giúp mọi người viết nhanh hơn và không hề hết mực nhanh 

k nha

vỉ nó có mực    đừng bấm đọc tiếp

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ĐỌC ĐẾN ĐÂY THÌ CHO .

Vì cây bút  bi có một viên bi nhỏ ở đầu bút, ở đầu ống mực bút bi có 5 rãnh nhỏ để có thể cho mực đi qua.

Ngu vãi l,"bút bi"sinh ra để viết sao mà ko ra mực,trừ khi hết mực hoặc là tắc mực thì ko viết dc

Vãi l chảnh chosoooooooooooooooooooooooooooo!

theo mk bạn phạm vũ diệu linh làm đúng