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CO2焊机根据送丝方式可分为三种，一种为（）；一种为（）；还有一种为（）。
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Moderate Earthquake Strikes England A moderate earthquake struck parts of southeast England on 28 April 2007, toppling chimneys from houses and rousing residents from their beds. Several thousand people were left without power in Kent County. One woman suffered minor head and neck injuries. "It felt as if the whole house was being slid across like a fun-fair ride," said the woman. The British Geological Survey said the 4. 3-magnitude quake struck at 8:19 a.m. and was centered under the English Channel, about 8.5 miles south of Dover and near the entrance to the Channel Tunnel. Witnesses said cracks appeared in walls and chimneys collapsed across the county. Residents said the tremor had lasted for about 10 to 15 seconds. "I was lying in bed and it felt as if someone had just got up from bed next to me." said Hendrick van Eck, 27, of Canterbury about 60 miles southeast of London. "I then heard the sound of cracking, and it was getting heavier and heavier. It felt as if someone was at the end of my bed hopping up and down." There are thousands of moderate quakes on this scale around the world each year, but they are rare in Britain. The April 28 quake was the strongest in Britain since 2002 when a 4.8-magnitude quake struck the central England city of Birmingham. The country's strongest earthquake took place in the North Sea in 1931, measuring 6.1 on the Richter scale. British Geological Survey scientist Roger Musson said the quake took place on 28 April in an area that had seen several of the biggest earthquakes ever to strike Britain, including one in 1580 that caused damage in London and was felt in France. Musson predicted that it was only a matter of time before another earthquake struck this part of England. However, people should not be scared too much by this prediction, Musson said, as the modern earthquake warning system of Britain should be able to detect a forthcoming quake and announce it several hours before it takes place. This would allow time for people to evacuate and reduce damage to the minimum. Musson predicted that another earthquake would occur in southeast England sooner or later.（）
赵金宝，男，53岁，原在市机床厂做车工。2009年，由于企业改制，他由企业人变成了失业者，不久，他的妻子也从一个小旅馆失业了。夫妻双双失业，还要养活上大学的儿子，赵金宝一下子对生活失去了信心，因心情不好经常与妻子吵架。 失业后，赵金宝和妻子卖过早点和午间盒饭，一天下来腰酸背痛，还要赶回住在郊外的家，总觉得辛、酸、苦、辣一齐向他袭来。赵金宝怎么也想不通，辛辛苦苦干了几十年的工作怎么一下子就没有了。卖早点和盒饭风风雨雨三年多，也没能挣几个钱，妻子还落下了风湿性关节炎的毛病，家里生活需要钱，儿子继续深造更需要钱，生活的重担像一座大山压得他喘不过气来。这时他开始萌生找活干的想法，他打过很多零工，但总漂泊不定，没有找到一个适合他的工作。 今年3月，赵金宝一家因原住地拆迁搬到了新晨社区，社区劳动保障协理员小丁在入户调查时，了解到赵金宝一家的情况，立刻向街道劳动就业社会保障服务所张所长进行了汇报，张所长指示小丁，要根据“就业援助工作机制”，立刻对“零就业家庭”的赵金宝一家实施就业帮扶。小丁先按照就业援助对象认定的有关程序，协助赵金宝申请了就业援助对象的相关登记认定。 赵金宝做过车工，对机械设备十分熟悉，小丁根据赵金宝这个特点，很快联系了下去的共建单位大众摩托卖场，介绍赵金宝去做维修工。由于赵金宝人品好，技术高，工作又积极肯干，卖场经理十分满意，经试用期后和赵金宝签了三年合同，月收入能达到2800元左右。不久，小丁又介绍赵金宝的妻子到辖区内的几户居民家做钟点工，使她不出社区大门就实现了就业，每月工资也超过了2000元。赵金宝夫妻有了较稳定的工作，家庭生活有了好转，夫妻两人也不再吵架了，脸上时常露出幸福的笑容。赵金宝的就业援助卡中，应包括的栏目内容是（）
研究材料工艺过程可从热力学和（）两个基本点出发，其中热力学是解决过程进行的可能性、方向及限度。
ESSBUS继电器是由以下哪个控制的？
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