题目: 圆盘过滤机主轴转速采用变频调速,可在()之间无极调速,性能可靠。A、0.3-1.0r/minB、0.4-1.5r/minC、0.3-1.5r/minD、0.4-2.5r/min 答案: 参考答案:B
题型:选择题 If we can ______our present difficulties, then everything should be all right.A.cone acrossB.get overC.come overD.get off 查看答案