A、<img width='111' height='41' src='/s/tiw/p3/UpLoadImage/2013-05-07/4429dbd4-63fa-48c3-8993-c817b535fea1.png'>
B、<img width='123' height='41' src='/s/tiw/p3/UpLoadImage/2013-05-07/245d0ddb-8783-4f5b-aaec-9137f1faa3a7.png'>
C、<img width='114' height='41' src='/s/tiw/p3/UpLoadImage/2013-05-07/b5cb18a6-3f05-47e2-9fba-f67ff0b76b09.png'>
D、<img width='104' height='40' src='/s/tiw/p3/UpLoadImage/2013-05-07/16deb247-0199-4fda-a890-3509f91708ac.png'>
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试题解析
两杆的伸长量分别为:
。两杆线应变分别为:
。