题目内容

移动对象时,对象的继承权限将不会改变。

A. 对
B. 错

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一发二收RTU即RTU同时向两级调度可发相同内容的数据。

A. 对
B. 错

Which kind of vessel is not required to comply with the ISM code until 2002?()

A. Passenger ships and high-speed crafts of 500 gross tons or more
B. Oil tankers and Chemical tankers and Gas carriers
C. Bulk freight vessels
D. General cargo vessels

信息可以双向传输的信通是全双工信通。

A. 对
B. 错

简答题 简述SDH的帧结构与虚容器。

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