【名词&注释】
隔热材料(insulating material)、珍珠岩(perlite)、泡沫塑料(foam)、救生艇(boat)、封闭式(closed-end)、值班人员(operator on duty)、轮机员(engineer)、重量轻(light weight)
[单选题]在常温和低温条件下，使用效果较好的隔热材料有( )。
A. 珍珠岩
B. 石棉
C. 泡沫塑料
D. 泡沫树脂
查看答案&解析
举一反三：
[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.
A. The closed-loop system differs from the open-loop system by
B. the lack of a feedback
C. the presence of a feed back
D. the lack of a computer
E. the presence of a computer
[单选题]我国《海船船员值班规则》对在港船舶轮机值班人员(operator on duty)组成规定：推进功率为______及以上的船舶，必须安排至少______机工协助值班轮机员(engineer)值班。
A. 750kW/1名
B. 3000kW/1名
C. 750kW/2名
D. 3000kW/2名
[单选题]部分封闭式救生艇的结构特点是（）
A. 便于登乘、操作，减轻了人员自我保护的负担
B. 便于登乘、操作、重量轻(light weight)，倾覆后人员不易逃离
C. 便于登乘、操作、避免了人员暴露、倾覆后人员不易逃离
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