When
carbon is added to iron in proper __________, the result is
steel.
A: rates
B: thicknesses
C: proportions
D: densities
carbon is added to iron in proper __________, the result is
steel.
A: rates
B: thicknesses
C: proportions
D: densities
举一反三
- When carbon is added to iron in proper _________ the result is steel.
- How does steel differ from pig iron? A: Less carbon B: More carbon C: Steel is preferred by sheep and chooks D: None of the above
- The word RESULT elevated its meaning from just “result”<br/>to “good result”. It added a ______ feature (+ good).() A: phonetic B: morphological C: semantic D: grammatical
- According to the passage, how did Bessemer method make the mass production of steel possible A: It directed air at melted iron in a furnace, removing all impurities. B: It slowly heated iron ore then stirred it and heated it again. C: It changed iron ore into iron which was a substitute for steel. D: It could quickly find deposits of iron ore under the ground.
- Iron and steel are flexible. But they are not as flexible ______ rubber. A) as C) to B) for D) by A: Iron and steel are flexible. But they are not as flexible ______ rubber. B: as C: for D: to E: by