【单选题】【消耗次数:1】
45钢是()
碳素结构钢
优质碳素结构钢
碳素工具钢
优质碳素工具钢
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相关题目
【单选题】 ( )包括碳素工具钢和合金工具钢两种。
①  工具钢
②  硬质合金
③  高速钢
【单选题】 碳素结构钢的Q235C表示( )。
①  屈服强度为235N/mm2,C级沸腾钢
②  屈服强度为235N/mm2,C级半镇静钢
③  屈服强度为235N/mm2,C级镇静钢
④  屈服强度为235N/mm2,C级特殊镇静钢
【判断题】 低合金高强度结构钢与碳素结构钢比较,低合金高强度结构钢的综合性能好( )。
①  正确
②  错误
【判断题】 低合金高强度结构钢与碳素结构钢比较,低合金高强度结构钢的综合性能好( )。
①  正确
②  错误
【单选题】 下列碳素结构钢中含碳量最高的是( )。
①  Q235-AF
②  Q215
③  Q255
④  Q27524
【判断题】 随含碳量提高,碳素结构钢的强度、塑性均提高。
①  正确
②  错误
【单选题】 碳素结构钢按照()的下限值将其分为四个级别
①  A.导电率
②  B.屈服强度
③  C.可塑性
④  D.耐磨性
【单选题】 造船用的碳素钢属于()
①  普通质量碳素钢
②  优质碳素钢
③  特殊质量碳素钢
④  以上都不是
【判断题】 低合金钢比碳素结构钢更适合于高层及大跨度结构。
①  正确
②  错误
【判断题】 低合金钢比碳素结构钢更适合于高层及大跨度结构.
①  正确
②  错误
【判断题】 在大跨度、承受动荷载和冲击荷载的结构中使用碳素钢要比使用低合金高强度结构钢节约钢材20%~30%。( )
①  正确
②  错误
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【单选题】 Nowhere______asinthe park of the city.
①  the flowers were so beautiful
②  so beautiful were the flowers
③  so beautiful the flowers were
④  was the flowers so beautiful
【单选题】 If you check the route to your ____before starting off, you will save much trouble.
①  aim
②  purpose
③  destination
④  determination
【单选题】 ______,the boy doesnt study well.
①  As clever he is
②  Clever as he is
③  He is as clever
④  As he is clever
【单选题】 Poly______ have left school, for her bike is still here.
①  can’t
②  wouldn’t
③  shouldn’t
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【单选题】 Can I send a package with some fragile______?
①  items
②  itinerary
③  t terms
④  teams
【单选题】 — Its very windy and dusty in Beijing . —Well, more trees______ every year to stop the wind and sand.
①  should plant
②  should planted
③  can planted
④  must be planted
【单选题】 Notonly______ apromise,butalsohekeptit.
①  did his parents make
②  his parents made
③  does his parents make
④  has his parents made
【单选题】 __When can I come for the repaired computers? I need them tomorrow afternoon. __They______ be ready by 12:00.
①  should
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【单选题】 Little______ , but we’re flying to Beijing next weekend to celebrate his birthday.
①  does he know
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【单选题】 Not only______ a pay increase, they want reduced hours as well.
①  the workers wanted
②  did the workers want
③  the workers want
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