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问题 多项选择题

根据《供电营业规则》，以下关于临时用电说法正确的是（）。

A.用电终止时，如实际使用时间不足约定期限二分之一的，可退还预收电费的二分之一

B.超过约定期限二分之一的，预收电费不退

C.超过约定期限二分之一的，可退还预收电费的二分之一

D.到约定期限时，得终止供电

答案

参考答案：A, B, D

单项选择题

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．availability 

B．compatibility 

C．capability 

D．reliability
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单项选择题 A1型题

关于暴发性流脑下列描述中，哪项是错误的（）

A.高热、头痛，常伴呕吐

B.常见周围循环衰竭

C.皮肤黏膜广泛淤点及淤斑

D.双侧肾上腺出血

E.蛛网膜下腔大量脓性渗出物
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