( )for their help, we couldn't have finished the task ahead of time.
A.If it were not
B.Hadn't it been
C.Had it not been
D.If it was not
正确答案是C
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作用于某二层框架楼层标髙处的水平力分别为F1=15kN,F2=30kN,各层柱的侧移总刚度分别为K1=31000kN/m,k2=43000kN/m,试求该框架的顶点侧移值(mm).