Four Treasures of the Study refer to ______, ink, paper and ink slab.

Cast-in-place reinforced concrete floors can be classified into various types according to the stress and transmission conditions, but not including ( ). A: slab floor B: beam slab floor C: cast-in-place floor slab D: beamless floor

中国大学MOOC: “Four Treasures of the Study” include _____, _____, paper and the ink stones /ink slab.

It's built in the inevitable slab shape.

According to the elastic plate theory，when a concentrating load P is acting on the end of the slab，the max negative moment of the loaded slab strip mxmax=-0.465P.

The distributed reinforcements in the slab should be perpendicular to the stressed reinforcements.

According to the elastic plate theory，when a concentrating load P is acting on the end of the slab，the max negative moment of the loaded slab strip mxmax=-0.465P. A: 正确 B: 错误

The______________________________ are brush pen, ink stick, ink slab and paper.

For walls, a（）is a slab wider than the wall and extending the length of the wall

For the concrete pavement with slab of 25cm, the temperature gradient is ______℃/m if the temperatures for the top surface and bottom surface of the slab are 35℃ and 15℃, respectively. A: 80℃/m B: 140℃/m C: 60℃/m D: 140℃/m