Which of the following materials are natural? ( )
A: clay
B: feather
C: fibers
D: bone
A: clay
B: feather
C: fibers
D: bone
举一反三
- Which of the following materials belong to advanced materials？ A: Functional materials B: Smart materials C: Biomaterials D: All of the above
- From the attribute of materials, which two kinds of vernacular materials are classified ( )? A: Vernacular natural material B: Vernacular artificial materials C: Local materials D: Adaptable material E: Ecological materials
- Which of the following combining forms means “bone”?
- 中国大学MOOC: Which of the following is not the bone in the axial skeleton?
- Which of the following means cutting into the bone? A: osteotomy B: osteopathy C: osteotome D: osteoporosis