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【单选题】
缺陷探测率DDP是衡量一个公司测试工作效率的软件质量成本的指标。在某公司开发一个软件产品的过程中，开发人员自行发现并修正的缺陷数量为80个，测试人员A发现的缺陷数量为50个，测试人员B发现的缺陷数为50个，测试人员A和测试人员B发现的缺陷不重复，客户反馈缺陷数量为50个，则该公司针对本产品的缺陷探测率为（ ）。（5.4 软件缺陷统计分析 知识点）A.
56.5%
B.
78.3%
C.
43.5%
D.
34.8%
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举一反三
【单选题】Several years after his retirement, the engineer's company ______.
A.
bought a very advanced machine
B.
had a very expensive machine out of order
C.
placed an order for a very expensive machine
D.
had difficulty destroying a very expensive machine
【简答题】无限叶片叶轮中流体完全沿着什么?
【单选题】某吸附指示剂pKa= 5.0，以银量法测卤素离子时，pH应控制在：
A.
pH ＜ 5.0
B.
pH ＞ 5.0
C.
5.0 ＜ pH ＜ 10.5
D.
pH ＞ 10.5
【判断题】Britain has always been culturally and ethnically diverse. There are many differences between England, Wales, Scotland and Northern Ireland and distinctive ways of life and identities within each nati...
A.
正确
B.
错误
【单选题】Mr Chen complained about the ______ air-conditioner he bought from the company.
A.
inefficient
B.
defective
C.
ineffective
D.
deficient
【单选题】某吸附指示剂pKa = 5.0,以银量法测卤素离子时,pH应控制在( )
A.
pH 〉 5.0
B.
pH 〈5.0
C.
5.0 〈pH 〈10.0
D.
pH〈 10.0
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