7. Ductile fracture in a tensile-test sample is also called.
a) cup-and-cone fracture b) transgranular fracture c) intergranular fracture d) cleavage
8. Which of the following is NOT right for rare-earth metals?
a) Rare-earth metals are generally difficult to mine and process, and hence are available in small quantities.
b) Rare-earth metals are less common in earth's crust than precious metals such as gold and platinum.
c) Rare-earth metals have unique magnetic and electrical properties, and are essential in many modern technologies.
d) The widely used rare-earth metals include yttrium, lanthanum, cerium, samarium, neodymium, etc.
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Home » Geography » 7. Ductile fracture in a tensile-test sample is also called. a) cup-and-cone fracture b) transgranular fracture c) intergranular fracture d) cleavage 8.