皮托管防冰系统为哪些部件提供防冰功能:()A.迎角传感器 B.大气总温探头 C.空速

题型:单项选择题

问题:

皮托管防冰系统为哪些部件提供防冰功能:()

A.迎角传感器

B.大气总温探头

C.空速探头

D.以上皆是

考点:民用航空器维修执照考试B737600700800系列飞机试题B737
题型:单项选择题

食盐是日常生活的必需品,也是重要的化工原料。

粗食盐常含有少量Ca2、Mg2、Fe3、SO42—等杂质离子,实验室提供的试剂如下:饱和Na2CO3溶液、饱和K2CO3溶液、NaOH溶液、BaCl2溶液、Ba(NO3)2溶液、75%乙醇、四氯化碳。实验室提纯NaCl的流程如下:

(1)欲除去溶液Ⅰ中的Ca2、Mg2、Fe3、SO42—离子,选出A所代表的多种试剂,按滴加顺序依次为i  NaOH   ii                      iii                 (填化学式)。

(2)请写出下列试剂加入时发生反应的离子反应方程式:

加入试剂i:                                              

加入试剂iii:                                              

(3)洗涤除去NaCl晶体表面附带的少量KCl,选用的试剂  为                 。(从提供的试剂中选)

(4)实验中用到的盐酸的物质的量浓度为0.400mol/L,现实验室某浓盐酸试剂瓶上的有关数据如下:

欲用上述浓盐酸配制实验所需浓度的稀盐酸480mL,

①配制需要的玻璃仪器有                        (填仪器名称)

②需量取的浓盐酸的体积为:                         

题型:单项选择题

根据短文内容,从短文后的选项中选出能填入空白处得最佳选项。选项中有两项是多余选项。请将选项写到答题纸上。

It is said that there are about 40,000 different kinds of jobs in the world. 小题1:“Finding a job ”is not the same as “choosing a job”. Many young people end up in a job which they are not suitable for . 小题2: Here are a few steps to help you think about jobs which you might enjoy doing after school or university.

First , it is important to realize what kind of person you are, which special qualities make you different from everyone else and what you are interested in . 小题3:If you like art and enjoy looking at pictures, this is an interest. But if you can draw a horse that looks like a horse instead of a big dog, that is a skill.

Then ask yourself this question: in the following three areas----skills with people, skills with  information and skills with things-----which are your best skills?

After examining your skills, the next step is research. To find out as many different kinds of jobs as possible, go to the library and read books, magazines and newspapers. 小题4:

Finally, trust your own ideas and your own thinking! 小题5:

A.It is your own life, so find something that you enjoy doing.

B.Choosing the right one itself is a difficult job.

C.We must know what our ideal jobs are.

D.There is a difference between an interest and a skillE. Ask your friends about the work they they do.

F. “Chance” may play a more important part than “decision”.

G. Your parents may also give you some useful advice.

题型:单项选择题

风云二号静止气象卫星的基本功能有哪些?

题型:单项选择题

国际疼痛协会将疼痛重新定义是

A.1959年

B.1969年

C.1979年

D.1989年

E.1999年

题型:单项选择题

开展城乡环境综合治理工作是近一段时间的工作。

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