第二类防雷建筑物上装设的避雷网的网格,下列四种尺寸中正确的是( )。A.≤10m×

题型:单项选择题

问题:

第二类防雷建筑物上装设的避雷网的网格,下列四种尺寸中正确的是( )。

A.≤10m×15m或≤16m×14m

B.≤10m×10m或≤12m×8m

C.≤15m×15m或≤12m×8m

D.≤30m×30m或≤24m×16m

考点:注册电气工程师供配电专业注册电气工程师专业考试(供配电专业)5
题型:单项选择题

注册商标专用权是商标注册人对其拥有的注册商标享有的独占权,包括()。

A.占有权

B.使用权

C.处分权

D.受益权

E.标记权

题型:单项选择题

篮球放在光滑水平地面上与竖直墙面相靠,且处于静止状态,则篮球的受力情况是(  )

A.受重力、水平面的支持力和墙面的弹力

B.受重力、水平面的支持力和墙面的静摩擦力

C.受重力、水平面的支持力和水平面的静摩擦力

D.受重力和水平面的支持力

题型:单项选择题

为了探究草酸(H2C2O4)的化学性质,设计如下3个实验:

实验1:取一定量草酸溶液装入试管,加入一定体积的酸性高锰酸钾溶液,振荡试管,发现溶液开始缓慢褪色,后来迅速变成无色。(反应热效应不明显,可忽略不计)

(1)该实验说明草酸具有________(填“氧化”或“还原”)性,该反应的反应速率先慢后快的主要原因可能是__________________。

实验2:取少量草酸晶体装入试管,加水溶解,向试管里滴加足量的澄清石灰水,有白色沉淀生成。

(2)该实验说明草酸具有______性。写出反应的化学方程式:__________________。

实验3:草酸在常温下呈无色晶体状,其晶体的熔化温度低于草酸的分解温度,且易升华。为了探究草酸的不稳定性,某同学设计如下实验装置

(3)B装置的作用是__________________。C装置变浑浊,E处无现象,G玻璃管里黑色变红色,写出A中反应的化学方程式:__________________。

(4)为了检验G中反应的氧化产物,H试管所装试剂是___________,从环境保护角度来看,该方案的不足之处是________________________。

题型:单项选择题

B

Singapore’s public transport system is one of the best in the world, so you should have no problem finding your way around like a local. There are three main forms of public transport that you would find in any other major city ---trains, buses and taxis

TRAINS 

Trains run from 6:00 am to midnight. Single trip tickets start at 80 cents. If you buy an EZ-Link cars for $15, you can ride the trains and buses as you like. 

If you need more information, just call Transit Link on 1800 767 4333. 

BUESE 

There are several bus services in Singapore and fares start at 80 cents. Be sure always ask the driver the cost of your ticket as he can not give change. 

If you need help, just call Transit Link on 1800 767 4333. 

TAXIS 

There are three main taxi companies –City Cab(6552 2222), Comfort(6552 1111) and Tibs (6552 8888). Booking can also be easily by calling the numbers listed above. 

TENTAL CARS 

Driving in Singapore is a pleasure and if you liked to travel at your own pace, renting a car is a good choice. Renting takes away the hassle of getting to places around Singapore. Just sit back and enjoy the city. It also means you’ll get to see a lot more that a trains or a bus won’t let you see. 

For car rental, call Avis on + 65 6737 1668. 

45  By an EZ-Link card, you can take_______.

A  both buses and trains                          B  only trains

C  both buses and taxis                           D  only rental cars 

46  When you take a bus there, always remember to________.

A  take your own license with you           B  ask the driver how much your ticket is

C  buy the bus map of Singapore             D  book your ticket ahead of time 

47  What does the word “hassle” mean in Chinese?

A 麻烦             B 乐趣                     C 景点                     D 费用 

48  What do you know about traveling in Singapore from the passage?

A  A local has no trouble finding his way around.

B  It’s much cheaper to go around by bus than by train.

C  You can see a lot more in Singapore only by renting a car.

D  It’s very convenient for visitors to travel in Singapore.

题型:单项选择题

患者,男性,22岁,近1周来无明显诱因出现四肢对称性紫癜,略突出皮面,瘙痒。该患者出现紫癜最可能的机制是()

A.血管异常

B.血小板数量不足

C.血小板功能低下

D.维生素K1缺乏

E.抗凝物质增多

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