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单选题
在位于从首垂线起0.25L以前，且在干舷甲板以上至少两个标准上层建筑高度的露天上层建筑甲板上时，其在甲板以上的围板高度应至少为（）。
A
230mm
B
450mm
C
760mm
D
900mm
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单选题（） means the person designated by the Company for ensuring that a ship security assessment is carried out; that a ship security plan is developed, submitted for approval, and thereafter implemented and maintained and for liaison with port facility security officers and the ship security officer.A
Ship security officerB
Company security officerC
Port facility security officerD
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a 30 second on 30 second off alternating signalB
the continuous blast of the ships whistle for not less than 10 seconds supplemented by the continuous ringing of the general alarm bells for not less than 10 secondsC
an intermittent ringing of the general alarm for not less than ten secondsD
announced over the PA system
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GlassB
BakeliteC
Soft ironD
Aluminum
考题
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Fire pointB
Flash pointC
Specific gravityD
viscosity
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Magnetic materials of the same polarity repel each other and those of opposite polarity attractB
The Earth's magnetic lines of force are parallel to the surface of the EarthC
Magnetic meridians connect points of equal magnetic variationD
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单选题舵设备做系泊试验前应查看（）。 Ⅰ，零部件材料的检查报告； Ⅱ，舵叶密性试验报告； Ⅲ，舵机整体装配验收报告； Ⅳ，舵叶设计报告； Ⅴ，操舵设备及传动装置的安装质量及完整性检查的验收报告。A
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Ⅰ，Ⅱ，Ⅳ，ⅤC
Ⅱ，Ⅲ，Ⅳ，ⅤD
Ⅰ，Ⅱ，Ⅲ，Ⅴ
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60%C
80%D
100%
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