按谱系分类法，汉语属（）语系，英语属（）语系，古梵语属（）语系。

口底蜂窝织炎首先防治___________和___________可根据病人呼吸困难程度考虑做___________;经静脉应用___________控制感染、适量应用激素、输血等以改善全身情况。局部应早做___________。

自然组织谐波的超声成像作用是（）

A.增加帧频

B.增加界面分辨力及清晰度

C.增加超声的穿透能力

D.提高声输出功率

E.减少超声的衰减

读我国华北平原商业中心分布示意图，分析完成下列问题。

(1)图中的商业中心都沿_______________分布。

(2)图中属大型商业中心的城市的有_______________、_______________、_____________。这些商业中心均分布于交通_____________地。

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.

阅读以下说明，根据要求回答问题。
[说明]
某软件公司承担了为企业开发电子商务系统的任务，为了保证软件系统的质量，软件公司在成立项目组的同时，成立了该项目的测试小组。测试组对软件开发的全过程进行了测试，重点针对软件的功能和性能进行测试。

性能测试是指在一定条件下系统的行为表现是否符合需求规格的性能指标。性能测试在保证软件质量中具有极其重要作用。为了完成性能测试，测试小组完成了以下工作：
A．故意使系统出错，利用系统恢复的过程，窃取用户口令及其他有用的信息
B．当系统出错时，检查能否在指定时间间隔内修正错误并重新启动
C．先进行简单多任务测试，然后修正缺陷，再增加系统的压力，直到系统崩溃
D．检查系统的哪些功能依赖于系统调用，是否属于某个平台或版本独有，在不同平台上运行是否有差异
其中，______是压力测试；______是容错性测试；______是安全测试；______是兼容性测试。