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The answer to the question above is letter B. For home service calls, the ideal soldering tool to use is the soldering iron. Soldering iron supplies heat to melt the solder so that it can flow to the joints between two work-pieces. 
marcobq1

Answer:

Soldering Iron

Explanation:

For home service calls, where more likely it's only required to join two pieces of metal and thus less heat is required, a soldering iron should be sufficient. In industrial settings where more heat is required a soldering gun might be more efficient.

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