液体中某点的绝对压强为100kN/m2，则该点的相对压强为：（）（注：当地大气压强为

The Middle East countries and other world powers have been facing major political tensions which have made the stability of the crude oil prices very unpredictable. Each day the prospect（前景）of oil prices has become more and more unclear.

Water fuel has been developed as an alternative source of fuel which has fast become popular around the world . This exciting technology has various advantages . More than 70 percent of the Earth is covered with water and this fuel source does not produce any harmful pollutants or dangerous emissions（散发物）either . They in fact also double the mileage（里程）of the cars that are powered by them .

Water fuel technology has been known to be the best additional form of fuel source for petrol or other fuel sources . However , any claim that this technology can be only an additional source and not a replacement is totally incorrect and misleading .such ideas have been implied by those who look down on this technology , On the contrary , this technology has numerous benefits such as it does not produce any harmful emissions which can affect the climate changes . It further helps to reduce the level of noise produced by the engines.

Various researches reflect that running costs on fuels for automobiles can be easily saved up to 40 percent with the help of water cell technology .This technology can easily work on various cars powered by gas . It can also be used for trucks , vans and other vehicles . The tap water can also be easily used directly and you do not need any special water that is specially treated to be used for this purpose . You can easily find a lot of details so that you can adapt your car to use the technology .

64. We can learn from the first paragraph that the price of oil______________,

A . has been rising for a long time   B is going down at present

C is unstable for political reasons   D is decided by powerful countries

65. Water fuel technology has many advantages EXCEPT that______________

A water fuel will not pollute the environment

B it is very simple to get such kind of fuel

C cars powered by the fuel can be used longer

D it has already been popular around the world

66. People holding the opposite idea think that______________.

A the world climate won’t be influenced by fuel

B petrol can’t be completely replaced by water fuel

C the engines will give out less noise than before

D water fuel can’t act as an additional source for gas

67.What is the best title for the text?

A. Water Fuel-Becoming a Reality Now        B. Water Fuel-Lower Cost

C. Water Fuel-a Long Way to Go             D. Water Fuel-a Safer Choice

患者男，56岁，因"胸痛13小时加重3小时"入院。患者发病前有饮酒史，后出现压榨性胸痛并向左上肢内侧放射。入院后查体：血压100／70mmHg，心率41次／分，心音低钝。心电图示：三度房室传导阻滞（Ⅲ。AVB），交界性逸搏心律，心率41次／分钟，STv1-3、4R抬高，STⅡⅢaVF压低。查心肌酶学肌钙蛋白明显增高，临床诊断为急性心肌梗死。现患者病情稳定，进行Ⅲ期康复。

该患者实施有氧运动训练方案，下列说法不正确的是（）

A.要做好准备活动和结束活动

B.必要时与药物治疗同时使用

C.不应在寒冷或高温的季节进行

D.饱餐、咖啡或浓茶后可进行活动

E.运动时不可以有显著气喘

F.运动后不可以有显著疲劳感

患者，男，25岁。肛旁时流脓水，口苦，小便赤。查局部，见截石位4点，距肛缘4cm，有一外口，外口呈凸型，脓水较稠厚，局部可扪得硬索，内口位于齿线肛窦处。其诊断是（）

A.低位单纯性肛瘘

B.低位复杂性肛瘘

C.高位单纯性肛瘘

D.高位复杂性肛瘘

E.低位多发性肛瘘

导游服务的文化性决定了导游服务不是一般意义上的服务工作，而是脑力劳动和体力劳动的高度结合，是一种高智商的工作导游人员不仅需要强健的身体，不仅需要熟练地待人接物技巧，不仅具有认真负责的态度，还应该掌握扎实的历史、地理、宗教、文学等多种学科知识，练就高超的语言表达能力，既是学者、教师，又是优秀的节目主持人，能成为游客的良师益友。

简述三拍子的特点。