检修车刷洗后允许有附于罐体的（）。A、水珠 B、锈皮 C、锈渣 D、油垢

WTO总干事拉米警告称， 目前保护主义威胁可能强于危机以来的任何时候，因为各国虽已采用其他政策来促进经济增长，但效果不够理想。商务部发布的数据显示，2002年到2012年我国共遭遇国外贸易救济调查案件842起，涉案金额高达736亿美元。以下对发达国家采取贸易保护主义做法原因的分析中，正确的是

①保护其本国的产业，促进经济的增长     

②其执政者要转移国内注意力，减轻政治压力

③经济全球化对发达国家的经济安全构成极大的威胁

④发达国家要通过贸易保护才能缩小与其他国家的贸易逆差

A．①②

B．①③

C．②④

D．③④

There is an English saying :“laughter is best medicine .”Until recently ,few people took the saying seriously .Now however ,doctors have begun to look into laughter and the effects it has on the human body .They have found that laughter really can improve people’s health .

Tests were carried out to study the effects of laughter on the body .People watched funny films while doctors checked their hearts ,blood pressure ,breathing and muscles .It was found that laughter had similar effects to physical exercise .It increases blood pressure ,the heart beating and breathing ; it also works several groups of muscles in the face ,the stomach ,and even the feet .If laughter exercises the body ,it must be beneficial .

Other tests have shown that laughter appears to be able to reduce the effect of pain on the body .In one experiment doctors produced pain in groups of students who listened to different radio programmes .The group that tolerated(忍耐)the pain for the longest time was the groups which listened to a funny programme .The reason why laughter can reduce pain seems to be that it helps to produce a kind of chemicals in the brain which diminish both stress and pain .

As a result of these discoveries ,some doctors in the United States now hold laughter clinics ,in which they help to improve their patients’ condition by encouraging them to laugh .They have found that even if their patients do not really feel like laughing ,making them smile is enough to produce beneficial effects similar to those caused by laughter .

小题1:Doctors have proved the following EXCEPT that      .

A．smiling does good to health

B．laughter can be tolerated

C．there is a way to reduce pain

D．laughter can work the muscles in the feet小题2:The main idea of the passage is       .

A. laughter and physical exercise have similar effects on the human body

B smile can produce the same effects as laughter

C. pain can be reduced by laughter

D. laughter is the best medicine

小题3:The students who    tolerated the pain for the longest time .

A．listened to different radio programmes

B．could produce a kind of chemical

C．don’t have stress of pain

D．listened to a funny programme小题4:The underlined word “diminish” is similar to       .

A．test

B．stop

C．reduce

D．increase小题5:Doctors hold laughter clinics _________.

A．to give better condition to their patients

B．in order to improve patients’ health

C．to make patients smile

D．to prove smile and laughter have the same effect

只有经公证机关依法公证并出具公证证明的，才可不进行实地见证

公路、城市道路、厂矿道路应采用硅酸盐水泥或普通硅酸盐水泥（简称普通水泥），水泥标号不应低于（）。

A.32.5

B.42.5

C.52.5

D.62.5

某水利水电施工承包商与业主签订了一份堤防工程施工合同，合同约定工期为68天；承包商工期每提前1天获奖励2000元，每拖后1天支付违约金3000元。承包商提交的施工网络进度计划如下图所示，该计划得到业主代表的认可。
在施工过程中发生了如下事件：
事件1：业主未能按时提供全部施工场地，使A、B两项工作的作业时间分别延长了3天和2天，造成这两项工作分别窝工8和10个工日，工作C未受影响。
事件2：在工作D施工时，主要施工设备出现故障，停工检修2天，造成窝工20个工日。
事件3：在工作E施工时，由于业主提供的主要材料不合格，造成返工，拆除用工30个工日，机械设备闲置3个台班，闲置台班单价为300元/台班，材料费损失2万元，因拆除重新施工使作业时间延长3天。
事件4：在工作F施工时，因设计变更，造成施工时间增加2天，多用人工15个工日，增加其他费用1万元。
问题：

在上述事件中，承包商可就哪些事件提出工期补偿和费用补偿要求为什么