Plastics are in wide use because they can be easily formed into complex shapes at low cost and are easily mass produced.
举一反三
- 中国大学MOOC: When the vocal folds are apart, the air can pass through easily and the sound produced is said to be voiced.
- Only after the students have mastered the rules of pronunciation ______. A: can they memorize words more easily B: when can they memorize words mere easily C: then they can memorize words more easily D: when they can memorize words more easily
- Many pure metals have little use because they are too soft, rust too easily, or have some other _______.
- And actually, you can easily download this jacket, and easily change the word to something else.
- Modern plastics can ______ very high and very low temperatures.