The primary function(s) of an automatic sprinkler system is(

The primary advantages of a Client/Server system arise from splitting the processing between the client system and the database server. Since the bulk of the database processing is done on the back-end, the speed of the DBMS isn't tied to the speed of the(31).The major disadvantage of Client/Server system is the increased cost of(32) and support personnel who maintain the database server. There is also the issue of(33)with so many parts comprising the entire C/S system; Murphy's Law can kick in-the more pieces that compose the system, the more pieces that can fail. It's also harder to track down problems when the system(34). And it can initially take longer to get all the components set up and working together. All this is compounded by the general lack of experience and expertise of potential support personnel and programmers, due to the relative newness of the technology. As C/S system become more common, this problem should abate.Therefore the C/S system is more(35).

A．network

B．operating system

C．personal computer

D．workstation

Pressure drop in an operating hydraulic system is developed ______.

A.only by the pump as its primary function

B.by resistance to the fluid flow through the system

C.by the thermal input to the system's fluid

D.solely(单独地) by the charge applied by the accumulators

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 closed-loop system differs from the open-loop system by

A.the lack of a feedback

B.the presence of a feed back

C.the lack of a computer

D.the presence of a computer

If the engine of a survival craft does not start, check to see ______.

A.that the fuel valve is open

B.if the air supply systen is open

C.if the water sprinkler system is open

D.if the limit switch in on

In the girl’s long painstaking training process, _____.

A. her adviser forms a primary challenging force to her success

B. her writing turns into an automatic pattern of performance

C. she acquires the magic of some great achievements

D. she comes to realize she is “hard-wired” to write

The sprinkler system of an enclosed lifeboat is used to ______.

A.cool the craft in a fire

B.cool the engine

C.spray oil on the sea to calm it

D.spray personnel during a fire

The Border Gateway Protocol(BGP)is an interautonomous system【S1】protoco1．The primary function of a BGP speaking system is to exchange network【S2】information withother BGP system．This network reachability information includes information on the list of Auton0．mous System(ASs)that reachability information traverses．BGP一4 provides a new set of mecha-nisms for supposing【S3】interdomain routing．These mechanisms include support for adver-tising an IP【S4】and eliminate the concept of network class within BGP．BGP-4 also intro-duces mechanisms that allow aggregation of routes，including【S5】of AS paths．These chan-ges provide support for the proposed supernettting schem

【S1】

A．connecting

B．resolving

C．routing

D．supernettting