6.在下列措施中不能预防沉桩对周围环境的影响的是

A．采取预钻孔沉桩                                      B．设置防震沟

C．采取由远到近的沉桩顺序                        D．控制沉桩速率

7.砖墙的一般日砌高度宜不超过

A．3米                                                         B．2.5米

C．2米                                                         D．1.8米

8.后张法施工较先张法的优点是

A．不需要台座、不受地点限制                     B．工序少

C．工艺简单                                                 D．锚具可重复利用

9.在吊装屋架时，吊索与水平夹角α

A．≥30°                                                    B．≤30°

C．≤45°                                                    D．≥45°

10.为保证场内运输畅通，主要道路的宽度不应小于

A．5M                                                          B．5.5M

C．6M                                                          D．6.5M