关于非竞争性心房起搏(NCAP)的描述,错误的是()。 A.NCAP功能可防止心房起

题型:单项选择题 A型题

问题:

关于非竞争性心房起搏(NCAP)的描述,错误的是()。

A.NCAP功能可防止心房起搏刺激信号落入其前面的自身心房激动后的易损期,进而避免诱发快速性房性心律失常,如房速、房扑、房颤等

B.只有落入心室后心房相对不应期的心房波被感知后,才能触发一个300ms的NCAP期

C.NCAP期结束的第一个心房起搏脉冲,其PAV间期等于程控的AV间期

D.NCAP功能仅存在于双腔起搏器,且仅在心房跟随模式时发生

E.有房性心律失常病史的病态窦房结综合征患者,可以开启NCAP功能

考点:心电学技术(主管技师)心脏起搏心电图心脏起搏心电图题库
题型:单项选择题 A型题

在证券市场中,要“顺势而为”,不“逆势而动”,已经成为投资者的共识。()

题型:单项选择题 A型题

阅读短文,选词填空,每空一词,每词只能使用一次。

Hua Lin, a Chinese boy of 13 years old,likes eating snacks very much. His 小题1:__snack is cream biscuits (奶油饼干). Sometimes he can eat three packs (包)a day.” I like eating them and I do not want to have anything 小题2:___.” he said.

Now in China there are many children like Hua Lin. They also enjoy snacks. It’s a小题3:__problem. Because they can’t get小题4:___nutrition(营养) from these things, and if they don’t try to eat more小题5:_food, they may become overweight.(肥胖的)

So parents,teachers and schools are worried 小题6:___them. Health experts (营养专家)tell students that they should have healthy eating 小题7:___. First, they must eat regular(规律的) meals instead of too many snacks, and have a good breakfast. Then they should have many different kinds of food,such 小题8:___vegetables,eggs and milk. They can give you what your bodies need. Some students also like fast food, like McDonalds or KFC. They think they are delicious, but 小题9:__too much is also unhealthy. Third, they can’t drink too many sugar(糖)drinks or eat too much fried food.

If they can do as the experts say, they will be healthier. They won’t be 小题10:___at school. They will have enough energy.

题型:单项选择题 A型题

下列实验操作能达到实验目的的是

 物质实验目的实验操作
A.CO2和HCl检验CO2将气体通入澄清石灰水
B. KNO3和NaCl固体分离溶解、过滤、蒸发、结晶
C.Cu粉中含有少量Fe粉除去Fe粉加入稀硫酸、再过滤、洗涤、干燥
D.CO2和CO除去CO点燃
 

题型:单项选择题 A型题

大跨度的工业厂房要采用( )结构。

A.砖木
B.砌体
C.钢筋混凝土
D.钢

题型:单项选择题 A型题

仓库按建筑形态分为()。

A.地面仓库

B.半地下仓库

C.地下仓库

D.多层仓库

E.立体自动化仓库

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