在恒温恒压下,向密闭容器中充入4mol A和2 mol B,发生如下反应:2A(

题型:选择题

问题:

在恒温恒压下,向密闭容器中充入4mol A和2 mol B,发生如下反应:2A(g)+B(g) 2C(g)  ΔH<0。2min后,反应达到平衡,生成C为1.6mol。则下列分析正确的是 (   )

A.若反应开始时容器体积为2L,则Vc=0.4mol•L-1•min-1

B.若在恒压绝热条件下反应,平衡后nc<<1.6mol

C.若2min后,向容器中再投入等物质的量A、C,B的转化率不变

D.若该反应在恒温恒容下进行,放出热量将增加

考点:化学反应速率的定义、公式
题型:选择题

根据短文内容,判断正(T)误(F)。

      This is an English boy. His name is Mike. He's twelve. His sister's name is Rose. She's thirteen. Mike and

Rose are in the same school, but they are in different classes. Mike is in Class One. Rose is in Class Two.

They go to school by bike.

      Mr. Gao is their English teacher. He teaches them English. His home phone number is 6898665. He has a

new computer. His e-mail address is Gao Min@yahoo. com. He puts the computer on the desk. He takes care

of it well.

( ) 1. Mike is older than Rose.

( ) 2. Mike and Rose are in different classes.

( ) 3. Mr. Gao is our English teacher.

( ) 4. Mike and Rose teach Mr. Gao Chinese.

( ) 5. Mr. Gao loves his computer very much.

题型:选择题

一个高为15cm的圆柱形笔筒,底面圆的半径为5cm,那么它的侧面积为______cm2(结果保留π).

题型:选择题

交换网络发生特别重大故障时,各级运维部门应按规定立即逐级口头上报,应该在分钟内报至总部。()

A、10分钟

B、15分钟

C、20分钟

D、30分钟

题型:选择题

患者,男性,20岁,发病后出现双侧周围性面瘫,吞咽困难,四肢驰缓性瘫痪,发病第5天出现呼吸困难,测动脉氧分压为50mmHg,应立即采取何种措施最为适宜()

A.血浆交换

B.地塞米松

C.气管切开,辅助呼吸

D.新斯的明

E.静脉注射免疫球蛋白

题型:选择题

图像的文件格式可以分为静态图像文件格式和动态图像文件格式,(1)属于静态图像文件格式。动态图像文件格式中,又根据是否适合网络传播,分为本地视频格式和流媒体文件格式,(2)属于流媒体文件格式。空白(2)处应选择()

A.MOV

B.JPG

C.MEPG

D.RM

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