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
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
举一反三
- The phrase “face shield” can be translated into .
- 2.It is the duty of servicemen to shield their country from invasion.
- shield
- 中国大学MOOC: The phrase “face shield” can be translated into .
- Living constantly in the atmosphere of slave, he became infected ______ the unconscious ______ their psychology. No one can shield himself ______ such an influence. A: on B: by C: from D: through