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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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磁粉探伤方法不能检测（)的缺陷。A.材料表面B.材料近表面C.奥.....
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16Mn钢焊接时焊条应选用（)。A.E4315B.E5015C.E5515－GD.E6015－D1..
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常用的CAD／CAM数据交换标准有 IGES、（)。..
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珠光体耐热钢在（)℃时仍保持有较高的强度。A.300－400B.400.....
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In winter, traffic accidents occur____ on the highway.A frequently B suddenly C usuall..
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