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【单选题】
关于钢制细长压杆承受轴向压力达到分叉载荷之后,还能否继续承载,下列四种说法中,正确的是( )。A.
不能,载荷达到临界值时屈曲位移将无限制的增加
B.
能,压杆一直到折断时为止都有承载能力
C.
能,只要横截面上的最大正应力不超过比例极限
D.
不能,超过分叉载荷后,变形不再是弹性的
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【简答题】He might not have been killed in the traffic accident yesterday if he (fasten) ______ the seat belt.
【简答题】He might have been killed in that car accident yesterday if he (take) ______ part in that activity with the team.
【简答题】传输视频图像信号用的同轴电缆,其特性阻抗为:
【单选题】_____right away , he might have been alive today .
A.
If he was operated on
B.
Had he been operated
C.
Was he operated on
D.
Should he be operated
【单选题】He might have been killed _________ the timely arrival of the ambulance.
A.
but for
B.
except for
C.
besides
D.
except
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