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【简答题】
Young people and older people do not always agree. They sometimes have different ideas about living, working and playing. But in one special program in New York State , adults and teenagers live together in a friendly way. Each summer 200 teenagers and 50 adults live together for eight weeks as members of a special work group. Everyone works several hours each day. They do so not just to keep busy but to find meaning and fun in work. Some teenagers work in the forests or on the farms near the village. Some learn to make things like tables and chairs and to build houses. The adults teach them these skills. There are several free hours each day. Weekends are free, too. During the free hours some of the teenagers learn photo-taking or drawing. Others sit around and talk or sing. Each teenager chooses his own way to pass his free time. When people live together, they should have rules. In this program the teenagers and the adults make the rules together. If someone breaks a rule, the problem goes before the whole group. They talk about it and ask, “Why did it happen? What should we do about it?” One of the teenagers has said something about it, “You have to stop thinking only about yourself. You learn how to think about the group.”
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【多选题】下列有关 金属腐蚀的叙述中,正确的是
A.
金属的电化学腐蚀比化学腐蚀更普遍
B.
用铝质铆钉铆接铁板时,铁板易被腐蚀
C.
钢铁在干燥的空气中不易被腐蚀
D.
用牺牲锌快的方法来保护船身
【单选题】下列有关资源的叙述正确的是(  )
A.
保护金属资源唯一的途径是防止金属的腐蚀
B.
大气资源中含量最少的物质是稀有气体
C.
人类可以利用的淡水量不到总水量的1%
D.
金属资源都以化合物形式存在
【判断题】不能创建abstract 类的实例,但是可以创建一个变量,其类型是一个抽象类,并让它指向具体子类的一个实例。
A.
正确
B.
错误
【单选题】下列有关金属及其腐蚀的叙述 , 正确的是 ( )
A.
铝比铁的抗腐蚀性好 , 是因为其表面易形成致密的氧化物保护膜
B.
锌比银活泼 , 故锌能置换出氯化银中的银
C.
生铁是混合物 , 钢是纯净物
D.
铜的化学 性质不活泼 , 故铜器放置在潮湿的空气中不会被腐蚀
【单选题】在面向对象的系统中,( )是对对象的抽象,对象是其具体实例。
A.
对象
B.
封装
C.
D.
消息
【单选题】下列有关金属的腐蚀与防护的叙述正确的是()。
A.
浸在淡水中的钢管,主要发生的是析氢腐蚀
B.
若采用外加电流进行保护,钢管应当与电源的正极相连
C.
钢管若需保护,可采用牺牲阳极的阴极保护法
D.
外加电流保护钢管时,电子从负极经过溶液流向正极
【单选题】求电路中15V电压源的功率(说明是吸收还是发出)。( )
A.
吸收20W功率
B.
发出20W功率
C.
吸收15W功率
D.
发出15W功率
【单选题】(2017·来宾)下列有关金属的叙述,正确的是( )
A.
钢中含碳量低于生铁中的含碳量
B.
合金的硬度比其纯金属的硬度小
C.
铝、铁、铜都是银白色金属
D.
铝能制成铝箔是因为铝有很好的抗腐蚀性
【判断题】材料的焊接工艺性是指材料的可焊性及焊缝产生裂纹的倾向性。 ( )
A.
正确
B.
错误
【单选题】下列有关金属的叙述正确的是
A.
合金的硬度比其纯金属的硬度小
B.
铝、铁、铜都是银白色金属
C.
铝能制成铝箔是因为铝有很强的抗腐蚀性
D.
钢中含碳量低于生铁中含碳量
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