In order to ensure the safety of the ship and its equipment

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[单选题]In order to ensure the safety of the ship and its equipment during UMS operation, certain essential functions （）.

A. must be provided
B. may be provided
C. have provided
D. can be provided

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学习资料：

[单选题]舵杆工作轴颈与舵叶轴承孔同轴度检验前，先将舵杆与舵叶组装在一起，并使（）。

A. 舵杆与舵叶法兰结合面贴紧
B. 法兰连接螺栓中至少有4个紧配螺栓
C. 舵杆与舵叶法兰结合面贴紧或法兰连接螺栓中至少有4个紧配螺栓
D. 舵杆与舵叶法兰结合面贴紧和法兰连接螺栓中至少有4个紧配螺栓

[单选题]To minimize corrosion, fuel oil strainer disks, spacers and scraper blades are made of （）.

A. brass
B. copper
C. iron
D. monel metal or stainless steel

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