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【多选题】
下面关于软件测试的说法正确的是（）A.
测试是最有效的排除和防止软件缺陷与故障的手段
B.
导致软件缺陷的最大原因是软件产品说明书
C.
软件测试可有可无
D.
软件测试在软件开发中的作用不大
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【简答题】完形填空。 If we were asked exactly what we were doing a year ago, we should probably have to say that we could not remember. But if we had 1 a book and had written in it an account (叙述) of what we did eac...
【单选题】We have to admit that never in the past twenty years ________ so greatly as before. [ ]
A.
did the city change
B.
the city has changed
C.
has the city changed
D.
the city had changed
【简答题】If we were asked exactly what we were doing a year ago, we should probably have to say that we could not remember. But if we had kept a book and had written in it an account of what we did each day, w...
【单选题】What we have to admit is that never in the past thirty years __________ so greatly as today.
A.
has China changed
B.
China has changed
C.
did China change
D.
China had changed
【简答题】简述环境噪声的特点
【简答题】简述环境噪声污染的特点。
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