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【简答题】
设计一个简易频率计。要求使用信号发生器产生高电平为5V,频率不高于500kHz的信号,并连接到单片机P3.5引脚上。频率数值显示采用4位八段数码管显示。 提交要求: 仿真截图(测量一个频率,要求信号发生器 和 虚拟示波器 PNG) C文件(代码 或 截图. PNG)
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举一反三
【简答题】Edward eagerly expressed his hopes, feelings, and frustrations in poems addressed to her.
【单选题】There were some seats left over _____every delegate had sat down.
A.
when
B.
until
C.
that
D.
where
【简答题】Some passengers have no seats.
【简答题】During the conference the speaker’ tried to ________ his feelings concerning the urgency of a favorable decision. A) comply B) impose C) imply D) convey
【简答题】在《三国演义》中有一位英雄,他曾温酒斩华雄、千里走单骑、刮骨疗毒,被后人敬仰并尊为中国的“武圣”,这位英雄是( )
【单选题】( ),some passengers have no seats.
A.
Occasionally
B.
Usually
C.
Frequently
D.
Fortunately
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