如图所示，质量为m的物块在力F作用下静止于倾角为α的斜面上，力F大小相等且FA.B.C.D.
A.
B.
C.
D.
参考答案：D
Ann is a top student in our school and she does well in her subjects.
A．is good to
B．is good at
C．is good for
D．is good with
如图7-25-1所示双盖板拼接的钢板连接，钢板用023s钢材。采用摩擦型高强度螺栓连接，螺栓性能等级为10.9级，M20。螺栓孔径d0为21.5mm。构件接触面经喷砂后涂无机富锌漆。
作用在螺栓群重心处的轴向拉力设计值N=800kN。试求一个螺栓的承载力设计值.与下列何项最接近().
A．95.2
B．97.7
C．100.5
D．105.6
