波高分析图上的波高为()。A.平均波高 B.均方根波高 C.有效波高 D.合成波高

题型:单项选择题

问题:

波高分析图上的波高为()。

A.平均波高

B.均方根波高

C.有效波高

D.合成波高

考点:海船船员考试航海气象与海洋学航海气象与海洋学题库
题型:单项选择题

癌性胸腔积液应鉴别的是()。

A.结核球

B.淋巴瘤

C.粟粒性肺结核

D.结核性胸腔积液

E.结核性空洞

题型:单项选择题

程序设计语言是用来编写程序的语言,通常分为()、汇编语言和高级语言三类。

A、C语言

B、机器语言

C、BASIC语言

D、数据库

题型:单项选择题

硝酸甘油为临床常用抗心绞痛药物,常与β受体阻断剂合用,其重要理由为

A.二者均可使心率减慢

B.二者均可使心室容积减小

C.二者均可使心肌收缩减弱

D.二者均可使心肌耗氧量下降有协同作用

E.在心室压力改变方面可相互拮抗

题型:单项选择题

数据库设计的根本目标是要解决( )。

A.数据共享问题

B.数据安全问题

C.大量数据存储问题

D.简化数据维护

题型:单项选择题

There is virtually no limit to how one can serve community interests, from spending a few hours a week with some charitable organization to practically full-time work for a social agency. Just as there are opportunities for voluntary service (1) (VSO) for young people before they take up full-time employment, (2) there are opportunities for overseas service for (3) technicians in developing countries. Some people, (4) those who retire early, (5) their technical and business skills in countries (6) there is a special need.

So in considering voluntary or (7) community service, there are more opportunities than there (8) were when one first began work. Most voluntary organizations have only a small full-time

(9) and depend very much on volunteers and part-timers. This means that working relationships are different from those in commercial organizations, and values may be different. (10) some ways they may seem more casual and less efficient, but one should not (11) them by commercial criteria. The people who work with them do so for different reasons and with different (12) , both personal and (13) . One should not join them (14) to arm them with professional experience; they must be joined with commitment to the (15) , not business efficiency. Because salaries are (16) or non-existent many voluntary bodies offer modest expense. But many retired people take part in community service for (17) , simply because they enjoy the work.

Many community activities possible (18) retirement were also possible during one’s working life but they are to be undertaken (19) seriously for that. Retired people who are just looking for something different or unusual to do should not consider (20) community service.

16()

A.lime

B.small

C.large

D.big

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