梯形螺纹（）测量中径的方法与测普通螺纹中径的方法相同，只是千分尺读数值M的计算公式不同。
A.单针
B.三针
C.量针
D.千分尺
参考答案：B
that people who read for pleasure have developed more imagination and good language skills than people who prefer to watch TV.
A．It believes
B．It has believed
C．It has been believed
D．It was believed
施工中建筑倒塌事故处置要点？
