HMHS Britannic Bell

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HMHS Britannic was the third and final vessel of the White Star Line's Olympic class of steamships and the second White Star ship to bear the …

常见问题解答

问:
Soldering wire, widely employed in connecting electrical leads, is almost always made of which pair of metals?
答:
The most common solders are basically alloys of lead and tin. Most solders contain 30 to 70 percent tin, with occasional minor additions for special purposes. The major...
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