采用氧气和氩气混合保护气体来焊接低碳钢和低合金钢时，混合气体中的氧的体积分数可达（）％。 -题库考试答案搜索网

采用氧气和氩气混合保护气体来焊接低碳钢和低合金钢时，混合气体中的氧的体积分数可达（）％。

单选题

2023-03-08 14:47

A、10
B、15
C、20

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正确答案

C

试题解析

标签：焊接与热切割机械工程大学试题工学

感兴趣题目

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

氩弧焊是以惰性气体氩气作为保护气体的一种电弧焊接方法。

熔化极混合气体保护焊是采用在惰性气体中加入一定量的其他惰性气体焊接的方法。

修理车身时，惰性气体保护焊焊接多用二氧化碳或二氧化碳和氩气的混合气体来进行保护。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

主要用于低碳钢和低合金钢焊接的气体保护焊方法是（）。

采用氧气和氩气混合保护气体来焊接低碳钢和低合金钢时，混合气体中的氧的体积分数可达（）％。

二氧化碳气体保护焊主要用于焊接低碳钢和低合金结构钢。

CO2气体保护焊焊接低碳钢和低合金钢时难以避免产生气孔。（）

使用熔化极混合气体保护焊焊接低碳钢、低合金钢时，混合气体选用（）较好。

氩弧焊采用氩气保护，焊接质量好，适于焊接低碳钢和非铁合金。

氩气和二氧化碳混合气体主要用于焊接碳钢和合金结构钢，也可焊接不锈钢。

相关题目: boost的意思是:help or encourage to increase or improve; eloquent的意思是:fluent or persuasive in speaking or writing; A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.; 用熔化极氩气气体保护焊焊接铝、镁等金属时，为有效去除氧化膜，提高接头焊接质量，应采取（　　）。; （）用可燃气体与氧气或压缩空气混合燃烧的火焰作为热源进行焊接。; （）any case or suspected case of quarantinable disease，or any case of eruptive disease or any death be discovered，the local quarantine officer must be notified immediately．; Should any case or suspected case of quarantinable disease，or any case of eruptive disease or any death be discovered，the local Quarantine Officer must be（）immediately.; Masters are（）solely responsible for all damages or accidents of whatever kind resulting from the navigating or handling of their vessels by day or by night.; 系统中雷达状态包括Unknown、Operational（or ON）、Failed（or OFF）、Detached。; The carrier is liable for loss of or damage to the goods or delay in delivery caused by fire，（）the claimant proves that the fire arose from fault or neglect on the part of the carrier，his servants or agents.; CO2气体保护焊，采用粗焊丝焊接的气体流量应比细焊丝焊接的气体流量大。; Shutdown price（or point，or rule）停业价格（或停业点、停业原则）; 翻译：With Average or With Particular Average（WA or WPA）（）; Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.; （）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.; A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.; The （） is used for hauling in or letting out the wires or ropes.; Vessels must be（）valid certificate of nationality or certificated of registry or license.; When loading or discharging dry mud or cement，crew members should use goggles and（）.; Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

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