价值尺度和价格标准的关系如何？

下列症状属于嗜铬细胞瘤的表现的是（）。

A.全身发热或四肢发凉

B.低血压

C.心动过速或心率缓慢

D.高血压

E.腹痛

鉴别Na₂SO₄、Na₂SO₃、Na₂CO₃、NaCl的稀溶液，可以选用的一组试剂最好是

A．AgNO₃、HNO₃

B．BaCl₂、HCl、Ca(OH)₂

C．BaCl₂、AgNO₃

D．BaCl₂、HCl、品红

有的单位规模小，会计业务也比较简单、财务收支数额也较小，这样的单位可以不设置会计机构，可以不办理会计事项。( )

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.

It is indicated in Paragraphs 1 and 2 that the global system the Internet security specialists gathered to start up（）

A. is still on the drawing board

B. can put an end to Internet fraud

C. has won specialists much acclaim

D. has multi-advantages over previous ones

按照《五金交电家电化工商品的购销合同实施办法》规定，供方错发到站、中转单位、收货单位及接货人，与需方同城的，由需方就近解决。供方应承担（）。

A、违约金

B、货物损失

C、由此造成的损失和费用

D、中国人民银行规定的罚金