[简答题]由桩径d＝0.8m的灌注桩组成群桩，其横向和纵向桩距S_ax＝S_ay＝3d，因大面积填土引起桩周产生负摩阻力，其平均负摩阻力标准值qⁿ_s＝15kPa，负摩阻区桩周土平均有效重度γ＇_m-＝10kN/m³，试求桩群的负摩阻力群桩效应系数η_n。

[判断题]摩擦桩是桩尖达到硬层一种桩，建筑物的荷载由桩尖阻力承受。( )

[判断题]摩擦桩是桩头达到硬层一种桩，建筑物的荷载由桩尖阻力承受。( )

[简答题]如果本工程的施工方法采用集中厂拌法施工时，其横向接缝应如何处理

[简答题]根据表1中已知梯形螺纹的大径d、螺距P和牙顶间隙a_c，试计算出外螺纹牙高h₃、中径d₂、内螺纹小径D₁、牙槽底宽W，并填入表中。
表1梯形螺纹计算 (单位：mm)

梯形螺纹 公称直径 d	螺 距 P	牙顶间隙 ac	螺纹牙高 h3	中 径 d2	内螺纹小径 D1	牙槽底宽 W
36	6	0.5
52	8	0.5
70	10	0.5

[多项选择]当桩周产生负摩阻力时，下述（）不正确。
A. 中性点以上桩周土的下沉量大于桩的沉降量，中性点处二者相等，中性点以下桩的沉降量大于桩周土的下沉量 
B. 负摩阻力值不应计入桩的荷载中 
C. 在地表附近，桩与土的相对位移值最大，因此负摩阻力最大 
D. 桩身轴力的最大值不是在桩顶，而是在中性点处

[简答题]根据表1-3中已知梯形螺纹的大径d、螺距P和牙顶间隙a_c，试计算出外螺纹牙高，h₃、中径d₂、内螺纹小径D₁、牙槽底宽W，并填入表中。

表 1-3 (单位：mm)
梯形螺纹 公称直径	螺距 P	牙顶间隙 ac	螺纹牙高 h3	中径 d2	内螺纹小径 D1	牙槽底宽 W
36	6	0.5
52	8	0.5
70	10	0.5

[判断题]圆筒形球面精车刀内孔直径D与工件圆球肖径d₁，以及球柄直径d₂有一定几何关系。( )

[填空题]
Employees say one thing and do another, a recent UK-based report claims. (0) H Addressing these problems is especially important when there are skills shortages, and companies are trying hard to retain the workers they have. According to the report, there is a consistent discrepancy between what really attracts staff and keeps them, and what they say are priorities.
The report found that, although there are differences in preferences, depending on age, home country and gender, all age groups say they rate the work/life balance as an extremely important consideration for staying with their particular company. (9) This is followed by job security and financial rewards.
However, despite their proclamations about wanting a work/life balance, it was established that this does not have a positive effect on retention for any subgroup. Similarly, people profess to identify more clo

[简答题]车削B32×6锯齿形螺纹，计算内、外螺纹中径D₂、d₂，基本牙型高度H₁，内螺纹小径D₁。

[填空题]当桩周产生负摩阻力时，桩相对于地基土的位移______(向上、向下)。

[简答题]在车床上加工多头米制蜗杆，大径d=80mm，轴向模数m_x=5mm、头数3，试计算螺距、中径、导程和导程角是多少？

[填空题]say it again