码头工人开始卸船.Dockers started unloading the ship.气力式负压抽吸机只适合粉状散装物料的卸船.Pneumatic negative pressure suction machine is only suitable for powder material.桥式抓斗卸船机是目前在散货码头中得到广泛应用的装卸设备.Bridge type grab ship unloader is widely used ...