Download Chieftain modern combat vehicles 1 by George Forty PDF

By George Forty

Chieftain (Modern strive against cars 1)

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Cross-linking is the formation of connections between the long-chain molecules in a polymer. It causes the polymer structure to be permanently altered. If the amount of cross-linking is low, the polymer is transformed into an elastomer; if cross-linking is significant, the polymer is transformed into a thermosetting polymer. 8 What is a copolymer? Answer. A copolymer is a polymer made up of two different types of mers, such as ethylene and propylene. 9 The arrangement of repeating units in a copolymer can vary.

An open mold is open to the atmosphere at the top; it is an open container in the desired shape which must be flat at the top. A closed mold has a cavity that is entirely enclosed by the mold, with a passageway (called the gating system) leading from the outside to the cavity. Molten metal is poured into this gating system to fill the mold. 5 Name the two basic mold types that distinguish casting processes. Answer. The two types are: (1) expendable molds and (2) permanent molds. 6 Which casting process is the most important commercially?

Multiple Choice Quiz There are a total of 25 correct answers in the following multiple choice questions (some questions have multiple answers that are correct). To attain a perfect score on the quiz, all correct answers must be given, since each correct answer is worth 1 point. For each question, each omitted answer or wrong answer reduces the score by 1 point, and each additional answer beyond the number of answers required reduces the score by 1 point. Percentage score on the quiz is based on the total number of correct answers.

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