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【简答题】
在用直径为d的标准圆试件做拉伸破坏试验时发现：1)具有光滑表面的低碳钢试件，当拉力到达屈服载荷Ps时，表面出现45°方向的滑移线(图(a))；2)当拉力到达最大载荷Pb时，硬铝试件没有出现滑移线而直接沿45°方向断裂(图(b))；3)当达到最大载荷Pb时，铸铁沿横截面断裂(图(c))，试根据各自的“破坏”原因，选择合适强度理论推出外加拉力P与相应强度指标的关系式。
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参考解析：
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举一反三
【单选题】In the wake of 11 September, Visionics, a leading manufacturer, issued a fact sheet explaining how its technology could enhance airport security. They called it "protecting civilization from the faces...
A.
Visionics produced the best face-recognition software enhancing airport security
B.
Visionics’s stocks rose in price
C.
the airports were satisfied with the software
D.
Visionics’s software was a great success
【单选题】In the wake of 11 September, Visionics, a leading manufacturer, issued a fact sheet explaining how its technology could enhance airport security. They called it "protecting civilization from the faces...
A.
any way, the face-recognition technology is good enough to frighten the terrorists
B.
the industry will have to recognize the real situation and work hard to improve the technology
C.
all the claims are premature
D.
we must not expect too much
【单选题】Passage 4 In the wake of 11 September, Visionics, a leading manufacturer, issued a fact sheet explaining how its technology could enhance airport security. They called it "protecting civ...
A.
Too many false alarms were raised.
B.
Everyone should look straight at the camera.
C.
Only 90% of suspects at an airport were found.
D.
Everyone should not disguise himself.