A.10
B.20
C.30
D.40
A.10
B.20
C.30
D.40
A.30%
B.50%
C.70%
D.80%
射频识别技术(RFID Radio Frequency Identification)实际上是自动识别技术(AEIAutomatic Equipment Identification)在无线电技术方面的具体应用与发展。()
A、Canopy-mounted spray systems
B、Shield sprays on the underside of the canopy
C、Air dilution
D、Unidirectional cutting sequence
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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