下面是天津、上海、北京、重庆四城市某日的天气预报。已知四城市

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问题单项选择题

下面是天津、上海、北京、重庆四城市某日的天气预报。已知四城市有三种天气情况，天津，北京的天气相同，上海和重庆当天都没有雨，那么，以下判断不正确的是()
A．天津小雨
B．上海多云
C．北京晴天
D．重庆晴天

答案

参考答案：C

单项选择题

在80C51单片机芯片的串行口电平采用的电平为（）。

A、TTL电平

B、RS232C电平

C、RS422电平

D、RS485电平

完形填空

填空

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