甲建设单位委托乙勘察单位对其工程建设条件进行勘察工作，乙单位经勘察向其提供了有一定问

某中学生，15岁。经骨髓穿刺检查诊断为"急性淋巴细胞白血病"，给以常规治疗，症状无缓解。医生告诉家长，此病目前尚无理想的治疗方法，医院正在尝试使用一种疗效不肯定、有一定风险的药物。其家长表示愿意做这种试验性治疗。但没有履行书面承诺手续。治疗二天后，病人病重，抢救无效，死亡。此后，家属否认曾同意这种治疗方案，称是"拿病人做试验"，要追究医生责任，于是造成医疗纠纷。

就本案分析，医生做出选择的伦理依据是（）

A.研究目的是正确的

B.符合知情同意的原则

C.符合受试者利益的原则

D.治疗期间，医生是积极负责的

E.以上各点都符合临床医学研究原则，没有错误

足少阳胆经阳交穴的位置在

A．外踝上7寸，腓骨前缘

B．外踝上7寸，外丘穴后1寸处

C．外踝上7寸，外丘穴前1寸处

D．外踝尖直上7寸，腓骨后缘

E．以上都不对

某人进行“观察叶片的结构“实验，所看到的菠菜叶横切面如图，下列说法错误的是（　　）

A．制作临时切片时，捏紧并排的两片刀片多切几次，要选取其中最薄的一片，制成临时切片进行观察

B．叶片与外界气体交换的“门户”是图中的[3]气孔

C．叶片中所有的细胞都能进行光合作用

D．气孔的开闭由[6]保卫细胞控制

A small group of Internet security specialists gathered in Singapore to start up a global system to make e-mail and e-commerce more secure, end the rapid growth of passwords and raise the bar significantly for Internet fraud, spies and troublemakers.
The Singapore event included an elaborate technical ceremony to create and then securely store numerical keys that will be kept in three hardened data centers there, in Zurich and in San Jose, Calif. The keys and data centers are working parts of a technology known as Secure DNS, or DNSSEC. DNS refers to the Domain Name System, which is a directory that connects names to numerical Internet addresses. Preliminary work on the security system had been going on for more than a year, but this was the first time the system went into operation, even though it is not quite complete.
The three centers are fortresses made up of five layers of physical, electronic and cryptographic security, making it virtually impossible to damage the system. Four layers are active now. The fifth, a physical barrier, is being built inside the data center.
The technology is viewed by many computer security specialists as a ray of hope amid the recent cascade of data thefts, attacks, disruptions and scandals, including break-ins at Citibank, Sony, Lockheed Martin, RSA Security and elsewhere. It allows users to communicate via the Internet with high confidence that the identity of the person or organization they are communicating with is not being tricked or forged.
Internet engineers like Dan Kaminsky, an independent network security researcher who is one of the engineers involved in the project, want to counteract three major deficiencies in today’s Internet. There is no mechanism for ensuring trust, the quality of software is uneven, and it is difficult to track down bad actors.
One reason for these flaws is that from the 1960s through the 1980s the engineers who designed the network’s underlying technology were concerned about reliable, rather than secure, communications. That is starting to change with the introduction of Secure DNS by governments and other organizations.
The event in Singapore capped a process that began more than a year ago and is expected to be complete after 300 so-called top-level domains have been digitally signed. Before the Singapore event, 70 countries had adopted the technology, and 14 more were added as part of the event. While large countries are generally doing the technical work to include their own domains in the system, the association of Internet security specialists is helping smaller countries and organizations with the process.

We can infer from the last paragraph that______.

A．the Net security system will catch on soon

B．engineers prefer to wait and see how things go

C．actions are taken to utilize the security system

D．more countries are supposed to invest in the system

抑制心衰时肾素血管紧张素系统的药物是

A．β-受体阻滞剂
B．米力农
C．多巴酚丁胺
D．洋地黄类
E．ACEI