对容易产生静电的场所,要(),或者铺导电性能好的地面;工作人员要穿防静电的衣服和鞋、靴,让静电及时导入大地,防止(),产生火花。
参考答案:保持地面潮湿;静电积聚
—It's a pity that Andrew didn't want to go to the conference.
—________ willing to go,we could have paid all his expenses.
A.Had he been
B.Being
C.Was he
D.He had been
对于区域城市化的水平、城镇人口分布及城市发展规模都能起到影响作用的是:
A.人口资源
B.科技水平
C.生产力
D.文化水平