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.
acts as
举一反三
- 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
- The period during (when) people (learned to) smelt iron is (called) (the) Iron Age. A: when B: learned to C: called D: the
- 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
- At the top of the A-frames there is a strong cast iron frame called （）.
- In addition to iron and carbon, list the other elements that may be found in a grey cast iron and describe their effect on the properties of a grey cast iron.
内容
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中国大学MOOC: Excess calcium intake can reduce iron absorption
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（） of the A-frames there is a strong cast iron frame called the scavenging air box.
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When carbon is added to iron in proper _________ the result is steel.
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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
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An advantage of aluminum pistons， when compared to cast iron pistons is （）.