弹性力学的研究任务是研究弹性体由于受外力作用或由于温度改变等原因而发生的应力,形变和位移。
查看答案
形函数的性质中,在单元任一点上,三个形函数之和不等于1
A. 对
B. 错
Ithasbeenreplacedbydeadboltlocks,securitychains, (1)alarmsystemsandtripwires (2) a policestationorprivateguardfirm.Many (3) families haveslidingglassdoorsontheirpatios,withsteelbarselegantly (4) sonoonecanprythedoorsopen. Itisnot (5) ,inthemostpleasantofhomes,toseepastedonthewindowssmallnotices(6) thatthepremisesareunder(7)bythissecurityforceorthatguard company.Thelockisthenew(8) ofAmerica.Indeed,a recentpublic-serviceadvertisementbyalargeinsurancecompany (9) notchartsshowinghowmuchatriskwe are,buta pictureofachild'sbicyclewiththenow-usualpadlock (10) it.
中国的文字是什么时候统一的()
A. 秦
B. 汉
C. 唐
D. 明