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单项选择题
According to ancient records, natural magnets were employed in China as direction-finding devices. This led to the first compass, called ( ) during the Warring States Period.
A、wet compass
B、Si Nan
C、dry compass
D、navy compass
B、Si Nan
C、dry compass
D、navy compass
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问答题
《行规》第50条：空线上禁止两端同时相对溜放（）
A.对
B．错
B．错
答案：
A. 对根据铁路行车组织的相关规定，空线上禁止两端同时相对溜放，以防止发生冲突或碰撞事故。这是为了确保铁路运输的安全性。...
