防治哮喘发作最有效的方法是() A.避免接触过敏原 B.避免剧烈运动 C.预防感染

题型:单项选择题

问题:

防治哮喘发作最有效的方法是()

A.避免接触过敏原

B.避免剧烈运动

C.预防感染

D.充分休息

E.吸烟者戒烟

考点:护士护理考试护师相关专业知识护师相关专业知识模拟试题(六)
题型:单项选择题

If someone is lost in a forest( 森林 ), he needs only study the trees around him carefully to find his way. On this half of the earth, he will find that the side of the tree with the most leaves and branches(树枝 ) is the south side. Also, by checking the tops of the trees, he will find that they lean(倾斜 ) to the south too.

Another sign( 标志物) for him to know where he is going is found in the bark.( 树皮) That is brighter on the south side.The remanining(树桩 ) of a cut tree is also a finder, for its rings can give him another sign. The rings will be thinner on the south side and thicker on the north side.

One more sign: some very small plants grow at the foot of a tree and they point to the north.

小题1: The passage is mainly about __________.

how to find a big tree if one is lost in the forest.

How to cut down trees in the forest

How to find the direction(方向 )in the forest

How to grow trees in the forest .

小题2: From a cut tree we can know that ___________.

A.the direction is written on it

B.the rings will be thinner on the south side and thicker on the north side

C.the rings will be thinner on the south

D.its rings can send messages to you小题3: The passage tells us __________ ways of finding the direction in the frorest.

A.three

B.four

C.five

D.six

题型:单项选择题

一个标有“6V、3W”的灯泡,不考虑其电阻随温度的变化.求:

(1)正常工作时电流多大?

(2)它的电阻为多大?

(3)现给定一电动势为9V,内阻为0.4Ω的电源与灯泡相连,要想使灯泡正常发光,应在电路中串联一多大阻值的电阻?

题型:单项选择题

采煤机用变频器采用的调速方式是()。

A、改变极对数

B、改变频率

C、改变转差率

D、改变电压

题型:单项选择题

SARS病人的血常规中哪些可能降低()

A.红细胞

B.血小板

C.白细胞

D.淋巴细胞

E.血红蛋白

题型:单项选择题

变频调速系统在基速以下一般采用()的控制方式。

A.恒磁通调速

B.恒功率调速

C.变阻调速

D.调压调速

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