单项选择题

Each box is an activity; the number it contains is the duration of the activity in days. The duration of the critical path is ______.

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单项选择题
Consumption of the total life-cycle effort in software maintenance is ______ that in software development.
A．less than
B．larger than
C．equal Or less than
D．equal or larger than
单项选择题
Which of the following is not part of a modern quality management concept ______
A．Performance standard is zero defects
B．Quality must be inspected in
C．85% of failures occur because of the process, not the worker
D．Quality is a 4 cycle process - plan/do/check/act
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