n. a piece of iron that attracts objects made of iron towards it, either naturally or because of an electric current that is passed through it
A: manual
B: layout
C: jungle
D: magnet
A: manual
B: layout
C: jungle
D: magnet
举一反三
- 中国大学MOOC: when a bar of iron attracts other pieces of iron，it ____a magnet，and thus the attraction is called mangnetism.
- when a bar of iron attracts other pieces of iron，it ____a magnet，and thus the attraction is called mangnetism. A: will be acted as B: acts as C: is acted as D: has been acted as
- In ancient time，there was no iron casting，so the needles were made of ______. A: stone B: tree C: iron D: mental
- When water pipes made with cast iron are frozen in winter, they will be expanded and cracked due to the expansion of ice, but the ice in the tube will not be destroyed, this is because _____.
- Magnet is to metal as () A: iron is to nail B: engine is to railroad C: element is to chemistry D: flower is to bee E: rose is to thorn