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What must a system owner do, once the threshold leak rate has been exceeded on any low-pressure system using an ozone-depleting refiigerant?
asked
May 1, 2020
Physics
high-school
1
answer
0
votes
95.6k
views
If calcium has the atomic number 20 mass number 40, both protons and neutrons are 20 would that make its electrons 18 or 22?
asked
Feb 3, 2019
Chemistry
middle-school
1
answer
3
votes
40.1k
views
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