【单选题】The __________people even keep the custom of offering nine-layer cakes to their ancestors on Winter Solstice.
【单选题】People like to eat mutton on Winter solstice because it can help them ________
D.
provide nutrition to the body
【简答题】炉外精炼加热目的是为了补偿钢水的__________,保证精炼任务的完成。
【简答题】( )就是在转炉或电弧炉出钢过程中通过钢液对合成渣的冲洗,以进一步提高钢水质量的一种炉外精炼方法。目前,转炉和电弧炉在出钢过程中普遍采用( )渣洗。
【判断题】On Winter Solstice, the sun reaches its southernmost point, the northern hemisphere has the shortest day.
【判断题】炉外精炼,就是将在转炉或电炉内初炼的钢液倒入钢包或专用容器内进行脱氧、脱硫、脱碳、去气、去除非金属夹杂物和调整钢液成分及温度以达到进一步冶炼目的的炼钢工艺。
【单选题】Eating dumplings on winter solstice is a custom to commemorate________
【简答题】会展组织者与参展商之间签订的主要是什么合同?
【单选题】向1毫升pH=1.8的盐酸中加入()mL水才能使溶液的pH=2.8。