A、treated
B、casted
C、strengthened
D、forged
喵查答案：strengthened
单选题：Metals may be ( ) and hardened by the uniform dispersion of several volume percent of fine particles of a very hard and inert material.
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单词 magnetorheological 的意思是 ( )。 -
A ( ) is an integral material to satisfy the user requirements, which are not attainable by the individual constituents. -
“impact strength”意思是 ( )。 -
Landfilling is the（ ）desirable method of dealing with municipal solid waste.
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