计费管理的目标是跟踪个人和团体用户对______的使用情况。

下列物质在一定条件下可与甲烷发生反应的是

A．氢氧化钠溶液

B．稀硫酸

C．氯气

D．酸性高锰酸钾溶液

下列诸项中（）是防止出现渗透变形的工程措施

A.水平铺盖

B.护坡

C.排水沟

D.盖重

E.反滤层

Americans have four primary avenues for making friends: at work, at school, through a hobby or a (1) such as volunteer work and discussion group, or through a family or (2) .
In American culture, a job is more than the work that one performs between the hours of 9 a.m. and (3) . Work becomes a major socializing influence. Many young mothers who (4) their jobs to care for small children remark on the loneliness of their new lifestyles because they have lost their forum for (5) .
A great number of American employers recognize business social (6) and use it to build a family atmosphere on the job so that employees will feel (7) in their work environment. Some employers arrange company get-togethers in their home or at a (8) . American companies have at least one (9) annually, usually at Christmas time. Many corporations have (10) where employees and administrators alike dress (11) to play games such as baseball and volleyball.
Top American administrators often hold social gatherings (12) . Depending upon the size of the employer’s home and the number of (13) . These social gatherings may be picnics, pool parties, or (14) . If the company is large, an employer may hold what Americans call (15) . For an open house, the employer will invite his employees to come to his home (16) between 1 p.m. on a certain day. Those invited usually stay for (17) , chatting with the other guests and their host. People come and go (18) during the designated hours, and the host keeps refreshments, usually (19) or hors d’oeuvres and beverages, available for all who come. For such social gatherings, it is considered (20) the invitation unless you have an excellent reason.

案例三　　　　一般资料：求助者，女性，20岁，大学三年级学生。　　案例介绍：求助者从大一第二学期开始，每到考试就紧张焦虑，就会想：“又要考试了，要是考不好可怎么办？我怎么见老师、同学？家人、朋友又会怎么看我？”考试一天天临近，她的情绪一天比一天紧张，甚至想到考试的场景，就会心跳加快，浑身发抖。明明知道没有什么可害怕的，可就是控制不住。求助者晚上入睡困难，有时半夜突然醒来，再也睡不着，只能睁着眼睛等到天亮，有时感觉不到饿，看什么都没胃口，吃什么都不香。受这种情绪困扰，无法正常复习，注意力不集中、记忆力下降、厌学，感到身心疲惫。考试时或大脑一片空白，或越想越乱、会答的题也答不出。考试成绩一次比一次差。求助者认为这样下去会越来越糟，心里十分痛苦，前来寻求帮助。　　心理咨询师观察了解到的情况：求助者从小成绩就好，家长对其期望很高，特别关心她的学业，而她自小也比较懂事，对自己要求很严格，自尊心较强，容不得失败。进入大学后，由于学习环境、学习方法与高中相比有很大的变化，求助者觉得学习较以前吃力，虽然老师同学也帮助其进行调整，但效果不明显，压力变大，精神紧张。

单选：按照许又新教授关于神经症病程的评分，该求助者应评（）。

A．1分

B．2分

C．3分

D．4分

PET显像又称为()

A．解剖显像

B．分子显像

C．原子显像

D．血流显像

E．阳性显像