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... Wankelengine转子发动机 want局部煤层尖灭 wantagerod罐空量杆 ...
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煤层厚度变化较大，总的规律是东厚西薄，局部分叉尖灭。
Generally it is thicker in the east-ern part, than in the western part and local offset and thin out.
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