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六、某工程,施工合同中约定:工期19周;钢筋混凝土基础工程量增加超出15%时,结算时对超出部分按原价的90%调整单价。经总监理工程师批准的施工总进度计划如图6-1所示,其中A、C工作为钢筋混凝土基础工程,B、G工作为片石混凝土基础工程,D、E、F、H、I工作为设备安装工程,K、L、J、N工作为设备调试工作。

 

施工过程中,发生如下事件:   事件1:合同约定A、C工作的综合单价为700元/m3.在A、C工作开始前,设计单位修改了设备基础尺寸,A工作的工程量由原来的4200m3增加到7000m3,C工作的工程量由原来的3600m3减少到2400m3.   事件2:A、D工作完成后,建设单位拟将后续工程的总工期缩短2周,要求项目监理机构帮助拟定一个合理的赶工方案以便与施工单位洽商,项目监理机构提出的后续工期可以缩短的时间及其赶工费率见表6-1.

 

 问题:

事件1中,设计修改后,在单位时间完成工程量不变的前提下,A、C工作的持续时间分别为多少周?对合同总工期是否有影响?为什么?A、C工作的费用共增加了多少?

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Fatigue is one of the most common complaints brought to doctors, friends, and relatives. You’d think in this era of labor-saving and convenient transportation that few people would have reason to be so tired. The causes of modern-day fatigue are diverse and only rarely related to excessive physical exertion. Today, physicians report, tiredness is more likely a consequence of underexercise than of wearing yourself down with overactivity.

Physical fatigue is the well-known result of overworking your muscles. (46) Physical fatigue is usually a pleasant tiredness, such as that which you might experience after playing a hard set of tennis, chopping wood, or climbing a mountain. The cure is simple and fast: You rest, giving your body a chance to get rid of accumulated waste and restore muscle fuel.

(47) Illness induced fatigue is a warning sign or consequence of some underlying physical disorder, perhaps the common cold or flu or something more serious like cancer, while other symptoms are present that often suggest the true cause. Even after an illness passed, you’re likely to feel dragged out for a week or more. (48) Take your fatigue as a signal to go slow while your body has a chance to recover fully even if all you had was a cold. Pushing yourself to resume full activity too soon will certainly prolong your period of fatigue.

Emotional problems and conflicts, especially depression and anxiety, are by far the most common causes of prolonged fatigue. When such feelings are not expressed openly, they often come out as physical symptoms, with fatigue as one of the most common manifestations. (49) Understanding the underlying emotional problem is the crucial first step toward curing psychological fatigue and by itself often results in considerable lessening of the tiredness. Professional psychological help or career or marriage counseling may be needed.

There is a great deal you can do on your own to deal with both severe prolonged fatigue and those periodic washed-out feelings. You might try to do moderate exercise. (50) Contrary to what you may think, exercise enhances, rather than drains, engery and helps you to resist fatigue by increasing your body’s ability to handle more of a workload. At the end of a day exercise can relieve accumulated tensions, give you more energy in the evening, and help you sleep more restfully.

(49) Understanding the underlying emotional problem is the crucial first step toward curing psychological fatigue and by itself often results in considerable lessening of the tiredness.