钢带输送机的卸载滚筒轴承每（）个月更换一次3号钙基润滑脂。
参考答案：三
Though _______ to see us, the professor gave us a warm welcome.
A．confusing
B．was confused
C．confused
D．being confused
采集终端拆除主要包含那几个步骤？
