题目内容
(请给出正确答案)
[主观题]
The following practices can help control respirable dust levels in the longwall shield?
A、Canopy-mounted spray systems
B、Shield sprays on the underside of the canopy
C、Air dilution
D、Unidirectional cutting sequence
提问人:网友gsnidi
发布时间:2022-01-07