What's class?[ ]
A. first
B. one
C. the first
答案:C
袋式收尘器的工作原理
弯制口外弓的内弓用()
A.0.9~1.0mm钢丝
B.1.4mm以下均可
C.1.0~1.2mm钢丝
D.1.4~1.6mm钢丝
E.1.2~1.4mm钢丝