单项选择题

What element enables the ceramic tape to lower its temperature

A．Copper.
B．Liquid nitrogen.
C．Clay.
D．Calcium.
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单项选择题
At what temperature does the superconducting ceramic lose its resistance
A．-143 degree Celsius.
B．-263 degree Celsius.
C．As long as it is ice-cold.
D．Absolute zero.
单项选择题
The weather was nice in Trumbull County on Saturday evening.
A． Right
B． Wrong
C． Not mentioned
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