SIMATIC S7可以采用（）连接到编程设备或其它设备。
A.MPI接口
B.PROFIBUS
C.工业以太网
D.以上都是
参考答案：D
----People should stop using their cars and start using public transport.
---- ________. The roads are too crowded as they are.
A．All right
B．Exactly
C．Go ahead
D．Fine
RNC的APBE单板接口一般情况下与CN对接时使用几个接口（）
A.1个
B.2个
C.3个
D.4个
