单项选择题

明清皇帝祭天在南郊,时间是冬至日;祭地在北郊,时间是夏至日。() A.
对 B.
错

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名称为减小五六和弦的是: A.
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单项选择题

As the device temperature increases, semiconductor materials tend to have ______.

A．an increasing number of free electrons
B．a decreasing number of free electrons
C．lower conduction levels
D．relatively unchanged conduction conduction levels