问题：USB接口有4根线，两根电源两根信号，信号是串行传输的。
参考答案如图所示
问题：FourPSis（）
A．Product strategies, Distribution strategies, Promotion strategies and Pricing strategies
B．Product strategies, Distribution strategies,People strategies and Pricing strategies
C．Product strategies, Place strategies, People strategies and Pricing strategies
D．Product strategies, Service strategies, Promotion strategies and Pricing strategies
参考答案如图所示
