正确答案: A

2,2

题目：57吊艇机的（）根吊艇索分别盘绕在吊艇机的滚筒上，排列整齐，不多于（）层。

解析：A

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举一反三的答案和解析：

[单选题]第一组An automatic system usually consists of a control system and an information system. A control system is a system which measures the condition of some entity and, with the information, governs the state of a variable; i.e., speed, temperature, pressure, position, etc. The open-loop system is the simplest form. a control system may assume. It is distinguished from the closed-loop system by the lack of an input which measures the state of the controlled variable; such an input is called a feedback. In modern ships the open-loop system has practically disappeared and the closed-loop system which operates with a feed-back is extensively used. An information system serves the parallel function of monitoring system or plant performance. The monitoring function may serve a number of purposes; specifically it may indicate values of controlled variables to guide remote control operations, warn of off-limit conditions and provide record of performance. In many cases a visual and audible alarm may be provided to warn of off-limit conditions on board ship and, associated with this, the important variables will be recorded on demand. The automatic control system can be more sophisticated by incorporating digital-processing equipment, that is, a computer. This computer is usually fed with signals from all sensors. It scans the values of the sensors and generates alarm signals for off-limit conditions, acting as a super-supervisor. Sometimes, it can even make necessary and take the necessary action to optimize performance without human intervention.

the presence of a feed back

[单选题]使用艇罗经时，其南北线与艇龙骨线_______。

平行

[单选题]对用于特定液货的加热介质应经()认可。应对加热盘管或导管的表面温度给予考虑，以避免货物局部过热或过冷而引起危险反应。

主管机关

[单选题]经( )为制冷压缩机加滑油必须停车。

曲轴箱加油螺塞

[单选题]海员在国内遗失海员证，需报告，由所在单位或派出单位向＿报告并申请补发；在国外遗失，应由所在船船长持书面报告向＿申请补发。

原发证港监，我国住外使领馆