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Câu 18: Để bảo quản, chống ẩm mốc đồ dùng làm bằng tre, mây, song, người ta thường làm gì?

Câu 19: Để xây tường, lát nền nhà người ta cần dùng vật liệu nào?

A.   Gạch                 B. Thủy tinh             C. Ngói                     D. Cao su

Câu 20: Xi măng được làm từ những vật liệu gì?

Câu 9: Gang và thép đều có thành phần nào chung ?

Câu 10: Để may quần áo, chăn màn người ta dùng vật liệu gì?

Câu 11: Để bảo vệ sức khoẻ về thể chất và tinh thần ở tuổi dậy thì chúng ta cần:

A.   Thường xuyên tắm giặt, gội đầu và thay quần áo.

B.    Ăn uống đủ chất.

C.    Thường xuyên tập thể thao.

D.   Tất cả các ý trên.

Câu 12: Để bảo vệ sức khỏe về thể chất và tinh thần ở tuổi dậy thì chúng ta không nên làm gì?

Câu 8: Dùng xi măng, cát, sỏi (đá) trộn đều với nước ta được gì?

Câu 7: Kim loại hay hợp kim nào dẫn điện và dẫn nhiệt tốt nhất?

Câu 5: Để phòng bệnh còi xương cho trẻ nên chọn cách nào dưới đây?

Câu 5: Để phòng bệnh còi xương cho trẻ nên chọn cách nào dưới đây?