窑炉按使用的能源不同分为电窑、煤窑、（）和油窑几种。
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越级行文只能在特殊情况下使用。
A. 正确
B. 错误
A chain bridle is used when towing astern because it（）.
A. is easy to connect
B. provides an effective catenary and absorbs shock due to its weight
C. makes rigging a swivel unnecessary
D. prevents the tow from yawing by the drag of the chains in a seaway
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