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1·The technical performance parameters, design features and multiple advance techniques adopted in model WD120 derrick crane are presented.

重点介绍WD120型桅杆式起重机的技术性能参数、构造特点及采用的多项先进技术。

2·Modules are transported offshore on deck barges and lifted into place by derrick or crane barges.

模块用甲板驳船运至海上，并由起重船或浮吊吊入适当位置。

3·Move the personnel platform slowly and cautiously without any sudden jerking of the crane, derrick, or platform;

缓慢谨慎地移动载人平台，吊车、塔吊或平台不能突然猛拉（突然迅速移动）。