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29—1 从下列条文括号内的词语中,择其正确词语,使之成为正确的联句。 (1) 象如图所示那样。气割低碳钢平板的边缘,切割完,经过相当长的时间后,在使用一侧的切割线中央部分,将会出现(塌陷;鼓出)变形。 (2) 气割用(直线型;扩散型)喷嘴,可得到超音速的喷流,故在适当的氧气压力下,不仅性能好,而且效率高。 (3) 用于气割预热的丙烷气比空气(轻;重)。 (4) 高速切割低碳钢薄板时,采用(气割;等离子切割)是有利的。 (5) 粉末切割(可以;不能)用于
29-1 Select the correct words from the words in parentheses below to make them correct. (1) As shown in the figure. Gas cutting mild steel plate edge, cutting finished, after a long period of time, in the use of the central part of the cutting line will appear (collapse; bulging) deformation. (2) gas cutting (linear; diffusion type) nozzle, you can get supersonic jet, so under the right oxygen pressure, not only good performance, but also high efficiency. (3) Propane gas for gas cutting preheat is lighter than air (light; heavy). (4) High-speed cutting of low-carbon steel sheet, the use of (gas cutting; plasma cutting) is beneficial. (5) powder cutting (can; not) used