RS232C接线时，串口1的脚2接串口2的（）。A、脚2 B、脚3 C、脚4 D、脚_爱下问搜题

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问题单项选择题

RS232C接线时，串口1的脚2接串口2的（）。

A、脚2

B、脚3

C、脚4

D、脚5

答案

参考答案：A

填空题

with, be, read, study, subject

       Pingping has a happy family. There   1   three people in her family. Her mother works in a hospital.
Her father is a reporter and he likes talking   2   people. Now he is   3    a newspaper on the sofa.
Pingping    4   hard at school and her favorite   5   is math. Now she is playing the piano.

单项选择题

新的献血者在献血前（）。

A.不需要指导

B.指导可以相对少些

C.需详细指导