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【多选题】
下列关于应力状态的说法正确的是:A.
纯剪切是单向应力状态
B.
构件中一点处各方位截面上应力的集合称为该点处的应力状态
C.
轴向拉压杆件可能处于二向应力状态
D.
单元体上没有切应力的面称为主平面
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举一反三
【单选题】Structural engineering steels are sometimes found to be brittle .
A.
at high values of strain
B.
at low ambient temperatures
C.
at moderate concentrations of carbon
D.
at high ambient temperatures
【判断题】According to carbon content, the steels are classified into low-carbon, medium-carbon, and high-carbon types.
A.
正确
B.
错误
【简答题】简述电火花线切割工艺指标的主要内容。
【单选题】Case carburising process is used to achieve in steels
A.
Improve surface hardness by adding surface layers with high carbon content
B.
Decrease hardness by transforming austenite to bainite
C.
Increase hardness by transforming austenite to martensite
D.
Increase hardness by transforming austenite to pearlite
【单选题】There are two general kinds of steels: _____ steel and _____ steel.
A.
carbon, alloy;
B.
high-speed, carbon;
C.
low carbon, high carbon;
D.
alloy, stainless
【判断题】32判断 According to carbon content, the steels are classified into low-carbon, medium-carbon, and high-carbon types.
A.
正确
B.
错误
【简答题】简述电火花线切割工艺指标的主要内容
【简答题】Explain the following:(a)A stainless steel containing 18% Cr has a BBC structure at room temperature,whereas a stainless steel containing 18% Cr plus 8% Ni has a FCC structure at room temperature.(b)H...
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