期梅毒的主要症状，多于不洁性交后出现，其时间是（） A.1周左右 B.2周左右 C.

一座楼房有6层，分为4个单元．每个单元第一层住2户，第二层到第六层各住3户，这座楼房一共可以住多少户？

患者，男，55岁，因“反复干咳2个月余，加重伴头面、上肢肿胀1周”来诊。体格检查：生命体征尚稳定，气紧明显，面部皮肤红肿，睑裂变小，颈部肿胀，静脉充盈，上胸毛细血管扩张，双上肢肿胀。当地医院胸部X线摄影提示“右上肺占位”。

接下来首选的治疗策略是（）.

A.化疗联合局部放疗

B.新辅助化疗后手术治疗

C.局部放疗后手术治疗

D.手术治疗后辅助化疗

E.手术治疗后辅助化、放疗

A bite of a cookie containing peanuts could cause the airway to constrict fatally. Sharing a toy with another child who had earlier eaten a peanut butter and jelly sandwich could raise a case of hives. A peanut butter cup dropped in a Halloween bag could contaminate the rest of the treats, posing an unknown risk.

These are the scenarios that "make your bone marrow turn cold" according to L. Val Giddings, vice president for food and agriculture of the Biotechnology Industry Organization. Besides representing the policy interests of food biotech companies in Washington, D. C., Giddings is the father of a four-year-old boy with a severe peanut allergy. Peanuts are only one of the most allergenic foods; estimates of the number of people who experience a reaction to the beans hover around 2 percent of the population.

Giddings says that peanuts are only one of several foods that biotechnologists are altering genetically in an attempt to eliminate the proteins that do great harm to some people’s immune systems. Although soy allergies do not usually cause life-threatening reactions, the scientists are also targeting soybeans, which can be found in two thirds of all manufactured food, making the supermarket a minefield for people allergic to soy. Biotechnologists are focusing on wheat, too, and might soon expand their research to the rest of the "big eight" allergy-inducing foods: tree nuts, milk, eggs, shellfish and fish.

Last September, for example, Anthony J. Kinney, a crop genetics researcher at DuPont Experimental Station in Wilmington, Del., and his colleagues reported using a technique called RNA interference (RNAi) to silence the genes that encode p34, a protein responsible for causing 65 percent of all soybean allergies. RNAi exploits the mechanism that cells use to protect themselves against foreign genetic material; it causes a cell to destroy RNA transcribed from a given gene, effectively turning off the gene.

Whether the public will accept food genetically modified to be low-allergen is still unknown. Courtney Chabot Dreyer, a spokesperson for Pioneer Hi-Bred International, a subsidiary of DuPont, says that the company will conduct studies to determine whether a promising market exists for low allergen soy before developing the seeds for sale to farmers. She estimates that Pioneer Hi-Bred is seven years away from commercializing the altered soybeans.

Doug Gurian-Sherman, scientific director of the biotechnology project at the Center for Science in the Public Interest—a group that has advocated enhanced Food and Drug Administration oversight for genetically modified foods—comments that his organization would not oppose low-allergen foods if they prove to be safe. But he wonders about "identity preservation" a term used in the food industry to describe the deliberate separation of genetically engineered and no nengineered products. A batch of nonengineered peanuts or soybeans might contaminate machinery reserved for low-allergen versions, he suggests, reducing the benefit of the gene-altered food. Such issues of identity preservation could make low-allergen genetically modified foods too costly to produce, Chabot Dreyer admits. But, she says, "it’s still too early to see if that’s true. \

What can be inferred about genetically modified foods from the text（）

A. People do not accept any genetically modified foods

B. All genetically modified foods will be of benefit to people’s health

C. Genetically modified foods still have a long way to go

D. Genetically modified foods will soon be sold in supermarkets

押品处置前应签订书面的《押品处置协议》，协议的内容至少应包括（）。

A.我行与债务人、抵（质）押人设立共管账户，并约定：押品处置变现价款由买受人直接转入共管账户，归还我行贷款，否则押品处置无效，我行不得释放抵（质）押权

B.押品处置价款优先清偿我行债权，不得挪作他用。所得价款不足以清偿全部债权的，应就不足部分向债务关联人继续追偿

C.我行对押品处置中涉及的法律纠纷不承担任何责任

D.押品处置必须在我行的全程监督下进行，不得发生有损于我行抵（质）押权的行为

模型校正的结果就是要使得MeAN ERRoR的值为零，RMSERRoR的值达到最小，一般要求小于（），并由此来判断模型的结果和实际环境的拟合情况。