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问题 填空题

-27的立方根是______；18的算术平方根是______．

答案

∵（-3）3=-27，

∴-27的立方根是：-3；

18的算术平方根是

18
=3
2
．

故答案是：-3；3

2
．

单项选择题

The presentation layer is concerned with the （） and semantics of the informationexchanged between two systems． The processes in two systems are usually exchanginginformation in the form. of character（）,numbers, and so on． The information should be changed to bit（）before ．being transmitted． Because different computers use different encoding systems, the presentation layer is responsible for（）between these different encoding methods． The presentation layer at the sender changes the information from its sender-dependent format into a common format． The presentation layer at the receiving machine changes the common format into its（）dependent format．

The presentation layer is concerned with the （） and semantics of the informationexchanged between two systems．

A．frequency   

B．syntax        

C．dialog      

D．Format
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单项选择题

某男，54岁。症见心前区刺痛，并放射至肩背，伴心悸怔忡，舌紫有瘀点，舌下脉络迂曲，脉沉细涩。其病机是

A．心阴虚亏
B．心血亏虚
C．心血瘀阻
D．肝阳偏衰
E．肝血不足
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