MCS-51单片机复位后程序计数器PC＝（）。
A.0FFFFH
B.2000H
C.0100H
D.0000H
参考答案：D
You can see as far as the Taibai Mountains on top of the building _____ the sky is clear.[ ]
A. when
B. where
C. though
D. because
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