Openullageholesintankswhicharenotgas-freemustbeprotectedby（）.
A. PVvalves
B. warningsigns
C. flamescreens
D. stop-checkvalves
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（）是最常见的磨损，约占磨损总量的一半。
A. 粘着磨损
B. 疲劳磨损
C. 磨料磨损
D. 腐蚀磨损
Bridgeordersmustbe（）andarecordofanyrequiredchangesinspeedanddirectionshouldbekept.
A. slowlycarriedaway
B. carriedoutwithaperiodofdelay
C. promptlycarriedout
D. paidbythecaptain
Theinternationalbodyresponsiblefordraftingtheconventionprohibitingmarinepollution(MARPOL)isthe（）.
A. MaritimeAdvisoryCouncil
B. InternationalMaritimeOrganization
C. InternationalAssociationofShipping
D. AssociationofSeafaringNations
在码头前沿进行集装箱装卸作业的装卸设备，称为（）。
A. 场桥
B. 岸桥
C. 跨运车
D. 叉车
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