《国民财富的性质与原因的研究》一书的作者是:()。
A.亚当·斯密
B.大卫·李嘉图
C.俄林
D.赫克歇尔
参考答案:A
The students ______ busily when Miss Brown went to get a book she ______ in the office.[ ]
A. had written; left
B. were writing; has left
C. had written; had left
D. were writing; had left
有一非抗震设计的简支独立主梁,如图3-6所示,截面尺寸6×h=200mm×500mm,混凝土强度等级为C30,纵向受力钢筋采用HRB400(),箍筋采用HPB300(φ),梁受力纵筋合力点至截面近边距离as=35mm。
已知q=10.0kN/m(包括梁自重),Vaq/Ra>0.75,Vaq为集中荷载产生的梁端剪力,Ra、Vaq、q均为设计值。梁端已配置φ8@150(双肢)箍筋。试问,该梁所能承受的最大集中荷载设计值P(kN),最接近下列何项数据()?
A.123.47
B.144.88
C.112.39
D.93.67