心室肌的有效不应期较长,一直持续到()A、收缩期开始B、收缩期中期C、舒张期开始D、

题型:单项选择题

问题:

心室肌的有效不应期较长,一直持续到()

A、收缩期开始

B、收缩期中期

C、舒张期开始

D、舒张期结束

考点:生理学生理学题库
题型:单项选择题

A、B、C、D、E五种溶液分别是NaOH、NH3·H2O、CH3COOH、HCl、NH4HSO4中的一种。常温下进行下列实验:

①B、D均能与pH=3的A溶液反应,当它们以等物质的量混合时均能恰好反应,反应后得到的溶液前者呈酸性,后者呈中性;

②浓度均为0.1mol/LC与D溶液等体积混合,溶液呈酸性。

回答下列问题:

(1)D是____________,E是___________;

(2)用水稀释0.1 mol/LB时,溶液中随着水量的增加而减小的是__________ (填写序号) 

a. b. c.c(H+)·c(OH)  d.n(OH)

(3)pH相同的等体积的两份溶液A和E,分别与锌粉反应,若最后仅有一份溶液中存在锌粉,且放出氢气的质量相同,则下列说法正确的是________(填写序号) 

a.反应所需要的时间E>A           

b.开始反应时的速率A>E

c.参加反应的锌粉物质的量A=E    

d.E溶液里有锌粉剩余

(4)室温下,向0.01mol·L-1 C溶液中滴加0.01mol·L-1 D溶液至中性,得到的溶液中所有离子的物质的量浓度由大到小的顺序为___________________。

题型:单项选择题

小陈从市场买回了几个番茄,并认真地进行研究分析:

(1)他切开一个番茄,有许多汁流出。这些汁水是_________,它来自细胞结构中的________。

(2)取另一个番茄,用开水烫过后撕下一层薄薄的表皮,这层表皮属于_________组织,表皮以内的部分是_________组织。

题型:单项选择题

治疗肝气犯胃型呕吐的首选组方是:

A.下脘、足三里、天枢、璇玑

B.章门、公孙、中脘、丰隆

C.内庭、中脘、足三里、太冲

D.上脘、梁丘、阳陵泉、太冲

E.大椎、合谷、内庭、中脘

题型:单项选择题
My brother and I were alone in our apartment. My parents had gone for a party and had left me in 36.I was doing my homework while my younger brother was watching television. 37 the doorbell rang. My younger brother rushed to the door thinking that our parents had come home; he unlocked the door and 38 it.
Outside, stood a tall man wearing a black raincoat. He said that he was a salesman and asked 39 if our mother or father was at home.
Without 40 , my brother said, “No.” He asked if we would like to 41 some comic books, which he was selling. I quickly explained that we were not 42 to buy anything without our parents’ 43 .
Then, as I was about to close the door, he 44 his way into our house. He took out a 45  and forced me to 46 up my brother’s hands with some rope. I tied up his hands but I tied it in a 47 way so my brother could untie himself. The man then tied my hands up and 48 both of us in the kitchen
 49 , he went upstairs to search the bedroom for 50 . I managed to teach my brother to untie the rope. He then united me. I 51 to the telephone to call the police, but the line was 52 . The doors were all locked from the outside .Luckily, the robber 53 to lock the kitchen window. My brother managed to get out of the house 54 the window.
My brother brought the police to our house and the robber was caught. The police 55 us for our good work.
小题1:
A.dangerB.chargeC.surpriseD.mess
小题2:
A.CarefullyB.QuietlyC.LoudlyD.Suddenly
小题3:
A.openedB.shutC.fastenedD.held
小题4:
A.nervouslyB.rudelyC.politelyD.anxiously
小题5:
A.thinkingB.watchingC.waitingD.questioning
小题6:
A.readB.keepC.sellD.buy
小题7:
A.planned B.supposedC.determinedD.pleased
小题8:
A.purpose B.money C.permissionD.absence
小题9:
A.forcedB.foughtC.feltD.doll
小题10:
A.ropeB.knife C.stick D.doll
小题11:
A.breakB.cover C.dress D.tie
小题12:
A.fineB.carelessC.specialD.possible
小题13:
A.lockedB.leftC.stationed D.beat
小题14:
A.AnywayB.SoonC.Still D.Otherwise
小题15:
A.SavingB.belongingsC.noblesD.valuables
小题16:
A.movedB.headedC.rushedD.knocked
小题17:
A.deadB.stolenC.offD.short
小题18:
A.triedB.forgotC.delayedD.preferred
小题19:
A.overB.byC.throughD.in
小题20:
A.admittedB.rewardedC.admiredD.thanked
题型:单项选择题

地下水()。

A.DO高,自净作用差

B.DO高,自净作用好

C.DO低,无自净作用

D.DO不变,自净作用好

E.DO低,自净作用差

更多题库