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背弯容易发现焊缝()缺陷。A.表面B.根部C.内部..
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It was three weeks later ____ he heard the news.A which B that C after D when..
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环性暗点见于A、视网膜色素变性B、高度近视C、球后视神经炎D.....
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IGES、STEP数据交换标准定义了产品信息的表示方法,是独立于.....
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焊接接头冷却到()时产生的焊接裂纹属于冷裂纹。A.液相线附近.....
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Only when I began to do it ____ that I had made a mistake.A I realized B I had realize..
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