题型:单项选择题 VLAN是的()缩写.A.virtual local area networkB.virtual long area networkC.virtual local area networkingD.virtua llong area networking 查看答案
题型:单项选择题 装卸货期间,双吊杆的调整应注意()。Ⅰ一定要水手长指挥水手调整作业;Ⅱ舷内吊杆不宜过低;Ⅲ稳索的布置力求加大与吊杆的水平夹角;Ⅳ防止吊杆发生回跳。A.Ⅰ~ⅣB.Ⅱ、Ⅲ、ⅣC.Ⅰ、Ⅲ、ⅣD.Ⅰ、Ⅱ、Ⅲ 查看答案