设nA为阿伏加德罗常数的数值。下列说法错误的是 A．1mol NH3中含有3NA

Metrorall (地铁)

Each passenger needs a farecard to enter and go out .Up to two children under age five may travel

Free with a paying customer .

Farecard machines are in every station .Bring small bills because there are no change machines in the stations and farecard machines only provide up to $5 in change.

Get one ticket of unlimited Metrorall rides with a One Day Pass .Buy it from a farecard machine in Metro stations .Use it after 9:30 a,m. until closing on weekdays , and all day on weekends and holidays .

Hours of service

Open 5am  Mon-Fri             7a.m  Sat-Sun

Open midnight Sun-Thur.

Last train times vary .

Train times Posted in stations

Metrobus 

When paying with exact charge , the fare is $1.35.When paying with a SmarTripⓇcard , the fare is

1.25.

Fares

Senior citizens 65 and older and disabled customers may ride for half the regular fare .On Metrorail and Metrobus , use a senior/disabled farecard or Smar/Trip Ⓡcard .For more information about buying senior .disabled farecard , SmarTripⓇcards and passes , please visit MetroOpensDoors .com or call 202-637-7000and 202-637-8000.

Senior citizens and disabled customers can get free guide on how to use proper Metrobus and Metrorall services by calling 202-962-1100.

Travel tips (提示)

. Avoid riding during weekday rush periods –before 9:30 a.m. and between 4and 6p.m.

. If you lose something on a bus or train or in a station, please call Lost &Found at 202-962-1195,

小题1:What should you know about farecard machines?

A．They start selling tickets at 9:30 a.m.

B．They are connected to change machines .

C．They offer special service to the elderly .

D．They make change for no more than $5.小题2:At what time does Metroarll stop service on Saturday ?

A．At midnight .

B．At 3 a.m.

C．At 5 a.m.

D．At 7a.m.小题3:What is good about a SmarTripⓇcard ?

A. It is convenient for old people .

B. It saves money for its users

C It can be bought at any train

D. It is sold on the Internet

小题4:Which number should you call if you lose something on the Metro?

A．202-962-1195

B．202-962-1100

C．202-637-7000

D．202-637-8000

As a result of the destruction of the forest, a large ________ of animals ________ lost their living places.

A．number; has

B．amount; has

C．number; have

D．quantity; have

眼球钙化见于（）

A、视网膜脱离 

B、脉络膜血管瘤 

C、眼球内转移瘤 

D、视网膜母细胞瘤 

E、黑色素瘤

属于神经 * * 炎临床特点的有（）

A.视野检查有中心暗点

B.眼底检查视 * * 充血、出血、渗出

C.一般不伴有眼球转动痛

D.眼压正常

E.视力急剧减退

二进制数11001对应的十进制数是

A．25

B．65

C．35

D．32