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2007-09-05 07:15:40 · 1 answers · asked by lovablechiquita 1 in Science & Mathematics Chemistry

1 answers

In some ways, they are like steel girders in a modern building. In another way, they are like the cables that move an elevator up or down.

2007-09-05 07:21:34 · answer #1 · answered by hcbiochem 7 · 0 0

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