(单选题)13: 为了进一步改善软件系统的可维护性和可靠性,并为以后的改进奠定基础的软件维护称为( ).
A: 纠错性维护
B: 适应性维护
C: 改善性维护
D: 预防性维护
1.(单选题)若集合A＝{a，{a}，{1，2}}，则下列表述正确的是()． A.{a，{a}}A B.{1，2}...
1.(单选题)—Howoftendoyougodancing — A.I will go dancing tomorrow. B.Yesterday....
1.(单选题)—Howlongisthiscellphoneguaranteed —______ A.No problem. B.You can re...
1.(单选题)—Wouldyouliketogotoattendtheconferenceonglobalwarmingwithme —______,...
1.(单选题)—Whatisthetrainingabout —_______ A.It is about the latest flood-proo...
要做作业扫码我