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What are the environmental laws established before and after RoHS?

Please list product related environmental laws established before and after RoHS, thx~~~
20:34 Mon 22nd Oct 20073 answers, last by Whickerman 21:24 Mon 22nd Oct 2007
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for_u21

what is the favourable material for making car engines?

I would like to ask the following questions: 1)What is the favourable material for making car engines? 2)Why that material is used? 3)Is it suitable to make car engines by silicon nitraide? why? thank...
19:26 Fri 10th Nov 20068 answers, last by Gef 01:08 Sun 12th Nov 2006

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