Project（71）is an uncertain event or condition that，if it occurs，has a positive or a negative effect on at least one project objective，such as time，cost，scope，or quality．

Project ______is an uncertain event or condition that，if it occurs，has a positive or a negative effect on at least one project objective，such as time，cost，scope，or quality．

● Project（71）is an uncertain event or condition that, if it occurs, has a positive or a negative effect on at least one project objective, such as time, cost, scope, or quality.（71）

 ______ twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city.

Is this（）longer or shorter?

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

The （） is used for hauling in or letting out the wires or ropes.

The（）may examine or re-examine the goods or take samples from them straightaway in the absence of the consignee or the consignor whenever it considers this necessary.

Jitter is an unwanted variation of one or more characteristics of a periodic signal in electronics and telecommunications and（）refers to call issues that cause variations in timing or time of arrival.

（ ）estimating is a technique for estimating the duration or cost of an activity ou project using historical data from a similar activity or project.

In my opinion this is a(an) ________ different matter.

已知“A、B二人中至少有一人懂英语”、“只有B刁懂英语，A才懂英语”和“A不懂英语并且B也不懂英语”这三个判断中，只有一个为真。据此，便可必然推出下列判断中为真的是（）。