简述在既有线CTCS-2级区段，应答器的设置的类型。
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为什么冬季低温时我的车后减振有响声？（针对速腾车型）
What is the best guide for determining the proper scope of anchor chain to use for anchoring in normal conditions（）.
A. One shot of chain for every ten feet of water
B. One shot of chain for every fifteen feet of water
C. One shot of chain for every thirty feet of water
D. One shot of chain for every ninety feet of water
特大安全事故发生后，按照国家有关规定组织调查组对事故进行调查。事故调查工作应当自事故发生之日起30日内完成，并由调查组提出调查报告。
A. 正确
B. 错误
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