单项选择题

数码管的电源应该接多少V电压？
A、 +24V
B、220V AC
C、+5V
D、+15V

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单项选择题

Which of the following is not the negative impact of the tariff increase on financial markets? A.
A little harm to US growth.
B.
A little pressure on inflation.
C.
An overall degree of uncertainty about Trump administration.
D.
Enormous conflict within the White House.

单项选择题

为了保证连接可靠性。TCP通常采用（）

A.3次握手
B.窗口控制机制
C.端口机制
D.自动重发机制