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Which of the listed refrigeration system components keeps th

题目
单选题
Which of the listed refrigeration system components keeps the refrigerant circulating through the system?（）
A

Expansion valve

B

Condenser

C

Evaporator

D

Compressor

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相似问题和答案

第1题：

Which two statements are true about the use of the procedures listed in the vsysaux_occupants.move_procedure column?()

A. The procedure may be used for some components to relocate component data to the SYSAUX tablespace from its current tablespace.

B. The procedure may be used for some components to relocate component data from the SYSAUX tablespace to another tablespace.

C. All the components may be moved into SYSAUX tablespace.

D. All the components may be moved from the SYSAUX tablespace.


参考答案：A, B

第2题：

The ____ is a general description of the architecture of a workflow management system used by the WFMC, in which the main components and the associated interfaces are summarizeD．The workflow enactment service is the heart of a workflow system which consists of several ____. In a workflow system, a process is specified using the process definition tool. Usually, processes are defined in terms of a ____, which consists of ____ indicated using a circle, and __请作答该选项__ shown as a rectangle. These two components can be linked by means of a directed arC．

A.trasitions
B.transformations
C.transmitters
D.changes

答案：A
解析：
工作流参考模型是WFMC用来对工作流管理系统架构的通用描述，在这个模型中，对主要组件和相关接口进行了概括。工作流例行服务是工作流系统的核心，由几个工作流引擎组成。在工作流系统中，过程是使用过程定义该来加以说明的。通常情况下，过程通过Petri网的术语来进行定义，其中包括位置（用圆圈表示）和变迁（用矩形表示），这两个组件通过带箭头的弧相连。

第3题：

The(71) is a general description of the architecture of a workflow management system used by the WFMC, in which the main components and the associated interfaces are summarized. The workflow enactment service is the heart of a workflow system which consists of several(72). In a workflow system, a process is specified using the process definition tool. Usually, processes are defined in terms of a(73), which consists of(74) indicated using a circle, and(75) shown as a rectangle. These two components can be linked by means of a directed arc.

A．waterfall model

B．workflow reference model

C．evolutionary model

D．spiral model


正确答案：B

第4题：

The (1) is a general description of the architecture of a workflow management system used by the WFMC, in which the main components and the associated interfaces are summarized. The workflow enactment service is the heart of a workflow system which consists of several (2). 空白（1）处填（）

  • A、waterfallmodel
  • B、workflowreferencemodel
  • C、evolutionarymodel
  • D、spiralmodel

正确答案:B

第5题：

Which service components develops a plan that identifies the necessary steps to move from an existing system to the Cisco Unified Communications system（）

  • A、Migration Plan Development
  • B、Detailed Design Development
  • C、Staging Plan Development
  • D、Implementation Plan Development

正确答案:A

第6题：

Which of the conditions listed will cause a refrigeration compressor to run constantly without simultaneously decreasing the temperature in the refrigerated space?( )

A.Shortage of refrigerant oil

B.Slight shortage of refrigerant

C.Excessive condenser cooling water flow

D.Faulty expansion valve


正确答案：B
解析：refrigeration：冷藏，制冷;constantly：恒定地;simultaneously：同时;de-crease：减少;refrigerate：冷藏，制冷;refrigerant：制冷剂;slight：轻微
译文：如果制冷压缩机持续运转的同时被冷却空间没有降温，其原因可能是制冷剂不足。

第7题：

Which three service components are in the operate phase？（）

  • A、System Monitoring
  • B、Operations Implementation
  • C、Incident and Problem Management
  • D、Change Management
  • E、Operations Plan
  • F、Project Close Out

正确答案:A,C,D

第8题：

(ii) Briefly explain the extent to which the application of sensitivity analysis might be useful in deciding

which refrigeration system to purchase and discuss the limitations inherent in its use. (3 marks)


正确答案：
(ii) Sensitivity analysis could be used to assess how responsive the NPV calculated in part (a) in respect of each decision
option change is to changes in the variables used to calculate it. The application of sensitivity analysis requires that the
net present values are calculated under alternative assumptions in order to determine how sensitive they are to changing
conditions. In this particular example then a relatively small change in the forecast cash flows might lead to a change
in the investment decision. The application of sensitivity analysis can indicate those variables to which the NPV is most
sensitive and the extent to which these variables may change before an investment results in a negative NPV. Thus the
application of sensitivity analysis may provide management with an indication of why a particular project might fail. The
directors of Stay Cool Ltd should give consideration to the potential variations in the independent variables which feature
in the decision-making process such as:
– estimated revenues
– estimated operating costs
– estimated working lives
– estimated repair costs
– the estimated discount rate i.e. cost of capital of each alternative investment.
Sensitivity analysis has some serious limitations. The use of the method requires changes in each variable under
consideration are isolated. However management may be focused on what happens if changes occur in two or more
critical variables. Another problem relating to the use of sensitivity analysis to forecast outcomes lies in the fact that it
provides no indication of the likelihood of the occurrence of changes in critical variables.

第9题：

Which three service components belong to the operate phase（）

  • A、Change Management
  • B、Operations Implementation
  • C、System monitoring
  • D、Incident Management
  • E、Operations Assessment

正确答案:A,C,D

第10题：

A user reports their system is displaying an error message ‘NTLDR is missing’. Which of the following is the MOST likely cause for this error?（）

  • A、BOOT.INI file is configured incorrectly
  • B、Corrupt MBR
  • C、Boot sector virus
  • D、System file is missing components

正确答案:B

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