购买的物品的价值可能低于消费者付出的货币量存在的知觉风险就是（）。 A.功能风险 B

The de facto standard Application Program Interface (API) for TCP/IP applications is the “sockets” interface. Although this API was developed for （71） in the early 1960s it has also been implemented on a wide variety of no-Unix systems. TCP/IP （72） Written using the sockets API have in the past enjoyed a high degree of portability and we would like the same （73） with IPv6 applications. But changes are required to the sockets API to support IPv6 and this memo describes these changes. These include a new socket address structure to carry IPv6 （74） ,new address conversion functions, and some new socket options. These extensions are designed to provide access to the basic IPv6 features requited by TCP and UDP applications, including multicasting, while introducing a minimums of change into the system and providing complete （75） for existing IPv4 applications.

A．applications 

B．networks 

C．protocols 

D．systems

按照养老保险基金筹资模式划分，养老保险制度存在现收现付式和( )两种模式。

A．强制储蓄式
B．基金式
C．国家统筹式
D．投保资助式

时效取得

赵先生参加由某旅行社接待的青岛、威海等地精品六日旅游团。在通往景区的旅游车上，导游陈某开始推销自费项目“帆船出海”，迫于无奈旅游团的部分团员交了200元/人。导游带领交钱的旅游者参加“帆船出海”，其他旅游者在车上等待。他们回来时天色已晚，导游说：“今天太晚了，万平口广场我们就不参观了，去了也看不到什么。”就这样合同行程中约定的参观万平口广场被取消了。请简述该案例中涉及的法律问题。

大煤浆槽上中控显示的液位计是（）、（），温度计是（）。