Answer:
High school diploma
Explanation:
The other three options don't really relate to this. A high school diploma [ and an associate/bachelor's degree (Not in health services or math)] will be the most beneficial.
Reasons why aluminum can not be soft soldered
Answer:
Soldering aluminum is not a common practice. The primary reason is that rapid formation of an oxide layer, and the difficulty in removing that oxide layer, inhibits solder wetting of the aluminum. When soldering copper, removal of the copper oxide is relatively easy with mild organic and inorganic fluxes.
Explanation:
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