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【单选题】
BX1—200型交流弧焊机的额定焊接电流为( )。A.
100A
B.
200A
C.
220A
D.
118A
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【简答题】1,固态物质分晶体和非晶体两类,金属属于哪类?晶体物质有何特征? 2,常见的金属晶格类型有哪些?晶格类型与金属的性能有何关系? 3,纯金属的结晶过程(规律)如何?冷却曲线什么样?什么是过冷度? 4,什么是单晶体、多晶体?何谓晶粒、晶界? 5,纯金属的实际晶体结构如何? 6,晶粒的大小与金属的性能有何关系?获得细晶粒的方法有哪些?
【单选题】The terrible earthquake in Yushu, ________so many buildings, made many people homeless. [ ]
A.
destroyed
B.
had destroyed
C.
having destroyed
D.
destroys
【简答题】金属的晶格类型有很多,纯金属常见的晶体结构主要为 、 、 。
【简答题】常见的纯金属晶格类型有哪些?试绘图说明其特征。试计算面心立方晶格的致密度。
【单选题】Three-fourths of the buildings ______.
A.
was destroyed
B.
is destroyed
C.
were destroyed
D.
has been destroyed
【单选题】Why are fabrics good for public buildings?
A.
They prevent buildings from noise.
B.
They make buildings strong.
C.
They make buildings beautiful.
D.
They make buildings special.
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