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You will hear a talk. As you listen, you must answer questions 21—30 by writing NO MORE THAN THREE words in the space provided on the right. You will hear the talk TWICE. What caused the collapse of the market centers according to the talk
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You will hear a talk. As you listen, you must answer questions 21—30 by writing NO MORE THAN THREE words in the space provided on the right. You will hear the talk TWICE. In terms of climate, what do you know about the southern area
风动齿形旋转式除锈器利用高速旋转的齿形片与金属表面的锈层摩擦实现对加工件的除锈，主要由齿轮除锈转盘与风动机两部分组成，适用于小面积和焊缝的清理。( )
低压带电作业应由两人进行，互相监护。（ ）
干弹丸除锈是利用机械力作动力，直接将铁丸推进并从喷嘴喷出，冲蚀钢材表面的铁锈、氧化皮和其他污染物，从而达到除锈清理的目的。( )
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