Software design is a(46) process. It requires a certain amount of fl air on the part of the(47). Design can not be learned from a book . It must be practiced and learnt by experience and study of existing systems. A well(48) software system is straightforward to implement and maintain , easily(49) and reliable. Badly(48) software systems, although they may work are(50) to be expensive to maintain , difficult to test and unreliable.
A.create
B.creative
C.creating
D.created
第9题
《中华人民共和国保守国家秘密法》规定,国家秘密的密级分为()。
A.“绝密”“秘密”两级
B.“特别机密”“一般机密”两级
C.“绝密”“机密”“秘密”三级
D.“国家机密”“地方机密”两级
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