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【单选题】
Two rods in tension with the same material, cross-sectional area load and different length are shown in the following figure, the cross section of one is circular and the other one is square. Then the of the two rods is different .A.
Axial normal stress( σ )
B.
axial line strain( ε )
C.
change in length( ΔL )
D.
transverse line strain( ε ’ )
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【简答题】一个标有“25V,2.5W”的白炽灯,正常工作时通过的电流为 ,电阻为 ,如果两端电压为20V,则电功率为 (电阻保持不变),如果两端电压为30V,可能造成的后果是 。
【单选题】根据以下内容回答题： When l was a child，I lived with my mother，my father having been away to work in the town．1 was then not（1）nine years old，lonely and expectant，（2）for things which I knew little about．1 walke...
A.
yet
B.
however
C.
but
D.
nevertheless
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