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)編號寫在答卷的對應(yīng)欄內(nèi)。

　　由兩個相同的計算機單元組成的雙工系統(tǒng)，λ和μ分別表示計算機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)在某一時刻以及下一時刻有兩個、一個和零個單元正常工作的概率。若假定兩個完好單元不會同時損壞且只有一個修理工進行維修，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，與不穩(wěn)定狀態(tài)相比，還滿足條件　B　。此時系統(tǒng)無故障運行的概率為　C　，系統(tǒng)能有效運行的概率為　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)填入下面英語文句中 ? 內(nèi)的正確答案，把編號寫在答卷的對應(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++

　　⑤FORTRAN ⑥SMALLTALK ⑦numeric

　　⑧nonalphanumeric ⑨structured ⑩unstructured

　　⑾to build ⑿build ⒀to be built

　　⒁built