物流中心在形成发展过程有以下的特点()。
A.人力资源迅速聚集
B.主导产业迅速形成
C.交通便利
D.资金迅速聚集
E.本地居民大量迁移
参考答案:A, B, D
纱线的细度不匀
How should you signal the crane operator to stop in an emergency?().
A.Extend arm with the palm down and and hold this position rigidly
B.Place clasped hands in frontof your body
C.extend arm and move hand rapidly right and left with the plam outward
D.Place both fists in front of the body with the thumbs pointing outward