2010年軟件水平考試系統(tǒng)分析員精選練習(xí)題

　　十、從供選擇的答案中，選出應(yīng)填入下面敘述中　?　內(nèi)的最確切的解答，把相應(yīng)編號(hào)寫在答卷的對(duì)應(yīng)欄內(nèi)。

　　由兩個(gè)相同的計(jì)算機(jī)單元組成的雙工系統(tǒng)，λ和μ分別表示計(jì)算機(jī)單元的故障率和修復(fù)率。用P2、P1和P0以及P2′、P1′和P0′分別表示系統(tǒng)在某一時(shí)刻以及下一時(shí)刻有兩個(gè)、一個(gè)和零個(gè)單元正常工作的概率。若假定兩個(gè)完好單元不會(huì)同時(shí)損壞且只有一個(gè)修理工進(jìn)行維修，則系統(tǒng)的狀態(tài)方程可寫成：

 

　　當(dāng)系統(tǒng)處于穩(wěn)定狀態(tài)時(shí)，與不穩(wěn)定狀態(tài)相比，還滿足條件　B　。此時(shí)系統(tǒng)無(wú)故障運(yùn)行的概率為　C　，系統(tǒng)能有效運(yùn)行的概率為　D　，系統(tǒng)完全失效的概率為　E　。

　　供選擇的答案

　　十一、從供選擇的答案中，選出應(yīng)填入下面英語(yǔ)文句中 ? 內(nèi)的正確答案，把編號(hào)寫在答卷的對(duì)應(yīng)欄內(nèi)。

　　OOP languages that create objects, such as A and B , are beginning to take hold as viable tools for programmers. To effectively reuse objects, programmers need a place to store them such as an ODBMS or an RDBMS with objectoriented extensions.

　　Databases that handle object data not only let user store and retrieve C data, but let them store objects created by OOP languages, to facilitate rapid software development and reuse, and let them D new multimedia applications combining multiple data types.

　　RDBMS vendors have developed new extensions to existing DB technology to accommodate the most common forms of E data.

　　供選擇的答案

　　A~E：①PASCAL ②BASIC ③C ④C++

　�、軫ORTRAN ⑥SMALLTALK ⑦numeric

　　⑧nonalphanumeric ⑨structured ⑩unstructured

　�、蟭o build ⑿build ⒀to be built

　　⒁built