题目内容
(请给出正确答案)
提问人:网友jxgzzwh
发布时间:2022-01-07
[主观题]
The characteristics of Longwall Shield?
A、more powerful and faster/cutting speeds exceeding 100 fpm
B、shield movement can be a significant source of dust
C、coal and/or rock fall from the top of the shield canopy directly into the airstream
D、requires shields to advance at a faster rate
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