DS6-11型计算机联锁系统的硬件结构包括（）、（）、（）和（）。
参考答案：控制台子系统；监测子系统；联锁子系统；输入输出接口
The US President Obama told the students that he ______ by a single mother who were strict with him and wished him great success in his studies.
A．will have been brought down
B．has been carried out
C．was brought up
D．was about to be cared for
开发、制造PB商品的主体是（）。
A．制造商
B．批发商
C．零售商
D．消费者
