正确答案: B

displacement

题目：(piston area)×(piston stroke)×(numbers of the cylinders)=engine( ).

解析：解析：brake：制动;displacement：排量，位移;clearance：间隙

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举一反三的答案和解析：

[单选题]夜间在海上，你船看到他船的号灯为品字形三盏绿灯，且在中间这盏绿灯下方还有一盏白灯，则说明驶近该船＿＿＿米以内是危险的。

１０００

[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]在请求无线电医疗咨询前，应对外伤病人准备哪些资料：

以上皆应准备

[单选题]现场指挥人员应向驾驶台报告的信息包括：1、火灾的位置、类别、范围2、火场中是否有人受困3、火场周围是否发现爆炸、毒害性物质4、火场的能见度5、控制火场通风的效果。

1、2、3、4、5