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Câu 49: High carbon_______used to make cutting tools.
a. steel
b. brass
c. mild steel
d. iron
âu 79: A insulator is a____ which does not ______ heat or current to flow easily.
Select one:
a. material / allow
b. metal / provide
c. metal / get
d. alloy / can
Câu 70: ______is a very strong artificial material, used for making clothes, rope, brushes, etc.
Select one:
a. alloy
b. ABS
c. nylon
d. plastic
Câu 45: What does the word "sự bôi trơn" mean English?
Select one:
a. brittle
b. lubricating
c. tough
d. stiff
Câu 59: Epoxy, polyester resin and urea formaldehyde are called ___________.
Select one:
a. thermoplastics
b. carbon steel
c. power tools
d. thermosetting plastics
Câu 48: What does the word " heat-resistant " mean Vietnamese?
Select one:
a. không bền nhiệt
b. bền nhiệt
c. chịu ẩm
d. chịu nước
Câu 74: Selecting phrase word that describes “metal”.
Select one:
a. by chemical processes and can be formed into shapes when heated.
b. It is a hard strong metal that is used to make steel and is also found in small quantities in blood and food.
c. a very strong artificial material, used for making clothes, rope, brushes, etc.
d. a type of solid mineral substance that is usually hard and shiny and that heat and electricity can travel through.
Câu 65: Which material often used electric wiring?
Select one:
a. copper
b. zinc
c. iron
d. brass
Câu 58: Bearing, gears and casings for power tools are made of nylon, which is hard, tough and __________.
Select one:
a. tear-resistant
b. wear-resistant
c. clean
d. rusted
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Sinh Học lớp 12
