填空题

______ theory is used frequently to interpret light.

【参考答案】

The wave
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单项选择题
A．Artificial hearts.B．Telescopes.C．Microscopes.D．Radio telescopes.
A．Artificial hearts.
B．Telescopes.
C．Microscopes.
D．Radio telescopes.
填空题
The representatives of the quantum theory are ______.
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