一般吊装作业中怎样选择吊装点?
参考答案:
一般吊装作业不需准确计算物体重心位置,而是估计物体的重心位置,然后用低位试吊的方法来逐步找到重心位置,确定吊点的绑扎位置。
改错。
( ) 1. Would you like some pops? _______________
A B C
( ) 2. What colour are your hair? _______________
( ) 3. I hear with my eyes. _______________
( ) 4. Show I your left hand. _______________
( ) 5. I has small ears. _______________
测得某处正线50kg/m钢轨9号道岔导曲线钢轨垂直磨耗为7mm,侧面磨耗为10mm,则其总磨耗为()。
A.10mm
B.12mm
C.13.5mm
D.17mm