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1. |
Why does an evacuated flat plate collector require a glass-metal seal? |
A. | To join the glass plate to the rest of metal envelope |
B. | To join the glass plate to a part of metal envelope |
C. | To disconnect the glass plate to the rest of plastic envelope |
D. | To disconnect the glass plate to the rest of metal envelope |
Answer» B. To join the glass plate to a part of metal envelope | |