单项选择题

当DeviceNet总线地址的第8、10、11号脚的跳线被剪掉（如下图所示），则此块I/O板的总线地址为？ A.
10 B.
14 C.
26 D.
42

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问答题

铁路线路分为正线、[填空(1)] 、段管线、岔线、安全线及避难线。

判断题

Before the speaker comes to the platform, the chairperson of the conference session usually makes a brief complementary introduction about the speaker. So, it is appropriate for the speaker to express thanks to the chair and greet the participants.

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