悬挑式脚手架的步距不大于1.8m,横向立杆间距不大于1m,()不大于1.5m。
参考答案:纵向间距
关于柴油机活塞环的叙述,不正确的是()
A.主要采用的材料是可锻铸铁
B.活塞环的硬度应比气缸套的硬度高10~20HB
C.可采用高磷耐磨铸铁
D.可采用表面强化工艺改善表面性质
________else in the world________in London can you experience 4 seasons in a single day.[ ]
A. Everywhere; rather than
B. Everywhere; other than
C. Nowhere; rather than
D. Nowhere; other than