单项选择题

Word默认的纸张大小是（）。

A.A4
B.B5
C.A3
D.16开

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单项选择题

当晶振频率是 12MHz 时，51 单片机的机器周期是()
A 1μs
B 1ms
C 2μs
D 2ms

单项选择题

In 19th century America, Romanticism had certain general characteristics except _____.
A、emphasis of imagination
B、faith in the value of individualism and intuitive perception
C、adoration for the natural world
D、emphasis of reason and rationality