脉搏骤起骤落，犹如潮水涨落，此种脉搏称为（） A.奇脉 B.迟脉 C.重搏脉 D.水

权重确定的方法中因素成对比较法的前提是()。

A．因素间的可成对比较性

B．因素间互补性

C．因素比较的可转移性

D．因素间明显差异性

26岁风心病二尖瓣狭窄伴二尖瓣关闭不全患者。发热2周，体检：体温38.3℃，口腔黏膜及下肢皮肤瘀点。心率104/min，律齐。二尖瓣区2/6级收缩期杂音及舒张期杂音，主动脉瓣区舒张期杂音，腹软，脾左肋下2cm，有压痛。该患者应进行下列哪项检查最能明确诊断

A．ESR+ASO
B．尿常规斗肾功能
C．血培养
D．心电图
E．RF因子

阅读下面这则材料，请你把营长的话修改成一条简洁明确的命令。（不超过40字）(5分)

据说在本世纪初，美国有一个营长对值班军官下达了这样一条命令：“明晚8点，哈雷彗星将在这个地区出现。这种情形每隔76年才能看到一次。命令所有士兵，身着野战服到操场集合，我将向他们解释这一罕见的天文现象。如果下雨的话，就到礼堂集合，我为他们放一部有关彗星的电影。” 这道命令由传令兵传达给连长，然后连长传达给班长，当班长对士兵下达命令时，命令竟然成了这样：“在明晚8点下雨的时候，著名的76岁的哈雷 * * ，将在营长的陪同下，身着野战服，乘坐他那辆“彗星”牌汽车，经过操场前往礼堂观看电影。”

Scientists are working to develop crop plants that can reduce the amount of water used for agriculture. Almost sixty percent of the world’s freshwater withdrawals from rivers, lakes and other water resources go toward irrigating fields.

Scientists are using biotechnology as well as traditional breeding methods to develop water-saving crops to feed a growing world.

Thomas “Tommy” Carter is a plant scientist in North Carolina. He works for the Agricultural Research Service in the United States Department of Agriculture. He leads Team Drought, a group of researchers at five universities. They have been using conventional breeding methods to develop and test soybeans that can grow well under dry conditions.

Tommy Carter started working on drought-resistant soybeans in 1981. His research has taken him as far as China, where soybeans have been grown for thousands of years.

Farmers in the United States, however, have grown soybeans for only about a century. Tommy Carter says the soybeans they grow are for the most part genetically similar. More differences could better protect crops against climate changes that can reduce production. Those changes include water shortages which could increase from global warming.

The Agriculture Department has a soybean germplasm(胚质) collection, a collection of genetic material passed from one generation to the next. Members of Team Drought studied more than 2,500 examples from the collection.

They looked at ones from the home of soybeans, Asia. They searched for germplasms that could keep plants from weakening and wilting (凋谢)during hot, dry summers in the United States.

Tommy Carter says they found only five. But these slow-wilting lines, he says, produce four to eight bushels（英斗）more than normal soybeans under drought conditions. The yield depends on location and environment.

Scientists are also working on other plants that either use less water or use it better, or both. For example, companies like Monsanto, DuPont and Syngenta have been developing corn with reduced water needs. Monsanto expects to be ready in a few years to market its first corn seeds genetically engineered to resist drought.

68. According to the passage, scientists try to find out how to _______.

A. grow crops with less water

B. increase crop production

C. feed a growing world

D. save the world’s water resource

69. Why did Tommy Carter come to China?

A. He likes traveling.

B. China has a long history.

C. He’s doing research into soybeans.

D. He works for the Agricultural Research Service.

70. What’s inferred from the passage?

A. Climate changes lead to global warming.

B. Water shortages contribute to global warming.

C. Genetically different soybeans need much water to grow.

D. Genetically different soybeans help to fight against damaging climate changes.

71. What do we know about slow-wilting plants talked about in the passage?

A. They yield big profits.

B. They can grow in almost any climate.

C. They seem to be drought-resistant.

D. They need much water for their growth.

在污水处理厂内，螺旋泵主要用作活性污泥回流提升。