已知双代号网络计划中,某项工作的ES=4天,EF=6天,D=3天,则该工作的TF为(

题型:单项选择题

问题:

已知双代号网络计划中,某项工作的ES=4天,EF=6天,D=3天,则该工作的TF为( )天。

A.6

B.4

C.3

D.2

考点:投资建设项目管理师投资建设项目实施投资建设项目实施
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请先阅读下面短文,掌握其大意,然后从方框内所给的词中选出最恰当的10个,用其适当形式填空。每个词限用一次。(每小题1分)
without     spend       free       busy       move      team
nature       what       cross      snowy     wet        child   
Have you heard about “Survival(生存) Holidays”? “Survival Holidays” is for   小题1: to go into the lonely place for exciting activities. Now about 1,100 companies are allowed to take children into the great outdoors   小题2: their parents.
The reason why people like “Survival Holidays” is that they think being close to  小题3: is good for children. Many children in big cities   小题4: all time watching TV and playing computer games. “Survival Holidays” gives them an important change.
Is “Survival Holidays” a wonderful idea? Maybe it is. Children need more   小题5: time to play. They need to be left on their own, without adults disturbing them. Parents care too much about their children. They like to see the children being   小题6:  with activities that are controlled by adults, which causes many problems. They don’t know   小题7: to do when they are in danger. Even something like 小题8:  a small river seems to be a hard challenge. Children are not comfortable with danger. Even slight danger like getting their feet  小题9:or falling down seems very terrible to them.
Many people think the survival activities are good for children. Even years later, they will still remember what they have learned. Some have learned to stay calm in different times. Some have learned how to keep safe. Others have learned how to work in a   小题10:.All these skills will help them a lot in their lives.
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