More “if the coal mining surface moves in a direction, this method is () long-wall coal mining. ”relevant issues
If the surface of coal mining moves in a direction, the preference is for such coal mining to be () long-wall coal mining. A to b tilt c horizontal
If the surface of coal mining moves in a direction, the preference is for such coal mining to be () long-wall coal mining。
A direction
B tilt
C horizontal
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If the surface of coal mining moves in an oblique direction, this method is () long-wall coal mining. A-b-d-d-d-d-a-d-d-d-d-d-e-d-d-e-d-e-d-d-d-e-d-d-e-d-d-e-d-d-d-d-d-d-d-d-d-e-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d-d
If the surface of coal mining moves in an oblique direction, this method is () long-wall coal mining。
A tilt
B direction
C can't judge
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Long-wall mining, which is the long-wall coal mining method, if the coal mining area moves in a direction。
A. Direction
B. Trends
C. Inclination
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The long-wall coal-mining surfaces are moving in the direction of the coal layer, usually longer than 100 metres. ( )
The long-wall coal-mining surfaces are moving in the direction of the coal layer, usually longer than 100 metres. ( )
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Coal mining surfaces advance from top to bottom in a tilted direction, known as () long walls。
A. Orientation
B. Trends
C. Tilt
D. Tilt
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Long-walled coal mining is the method of coal mining along the long-wall working surface. ( )
Long-walled coal mining is the method of coal mining along the long-wall working surface. ( )
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Coal mining is carried out along the coal layer () along the long wall。
A. Orientation
B. Trends
C. Hypocrisy direction
D. Hypocrisy direction
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Coal mining is carried out along the coal layer on the surface of the long tilt wall。
A. Orientation
B. Trends
C. Hypocrisy direction
D. Hypocrisy tendencies
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The essence of the long tilt wall for coal mining is that the long wall work surface is set along the direction, moving along the tilt. ( )
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The tilting of the surface of coal mining by long-walling is moving in a direction. ( )
The tilting of the surface of coal mining by long-walling is moving in a direction. ( )
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