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问题 单项选择题

办公室有甲、乙、丙、丁4位同志，甲比乙大5岁，丙比丁大2岁。丁三年前参加工作，当时22岁。他们四人现在的年龄之和为127岁。那么乙现在的年龄是（）

A．25岁

B． 27岁

C．35岁

D．40岁

答案

参考答案：C

解析：丁今年25，丙今年27，甲和乙今年共（127-25-27=75），甲-乙=5，所以乙今年35岁

单项选择题 A型题

源皮距（SSD）是指（）

A.射线源到治疗床面的距离

B.射线源到模体表面照射野中心的距离

C.射线源到人体皮肤表面某一点的距离

D.射线源到人体皮肤表面最近点的距离

E.射线源到人体皮肤表面最远点的距离
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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 processes in two systems are usually exchanginginformation in the form. of character（）,numbers, and so on．

A．numbers

B．functions

C．strings

D．Codes
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