问题 单项选择题 A1/A2型题

下列哪项不是拔罐法的禁忌证().

A.急性严重疾病、慢性全身虚弱性疾病及接触性传染病

B.血小板减少性紫癜、白血病及血友病等出血性疾病

C.老年、儿童与体质虚弱的患者

D.心尖区体表大动脉搏动部及静脉曲张部

E.瘰疬、疝气处及活动性肺结核

答案

参考答案:C

解析:老年、儿童与体质虚弱的患者施罐数宜少,留罐时间宜短,但不是拔罐法的禁忌。

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A Simple Scientific Experiment
Below is a description of a single scientific experiment  . It shows us how iron reacts ( 反应) with air and
with water.
Aim : To find out if iron rusts( 生锈) (a) in dry air ; (b) in water that has no air in it ( air- free water) ; (c)
in ordinary water.
Materials : 3 clean iron nails ( 铁钉) ; test tubes ; test tube holder ; cotton wool ; oil ; Bunsen burner.
Iron in dry air
Method
(1)Put some iron nails at the bottom of a test tube.
(2)Push some cotton wool down the tube.
(3)Leave the tube for one week.
Result
After one week, the nails have not rusted.
Conclusion
Iron does not rust in dry air.
Iron in air-free water
Method
(1)Half-fill a test tube with water.
(2)Boil the water for three minutes.( This makes sure
there is no air in the water.
Put two or three clean nails in the water.
(4)Add some oil to the water. ( This will keep
air out of the water.)
(5) Leave the tube for one week.
Result
The nails do not rust in the tube with air-free
water.
Conclusion
Iron does not rust in air- free water.
Iron in ordinary water
Method
(1)Half -fill a test tube with water and add two
or three clean nails.
(2)Leave the tube for one week.
Result
The nails rust in the tube with ordinary water.
Conclusion
Iron rusts in ordinary water.          
1.  In the first part of the experiment the cotton wool is most probably used to ______________.        
A. dry air                  
B. cotton wool          
C. ordinary water        
D. air-free water
2. What are necessary steps to make sure the water in the tube is air free?
①Leave half a tube of water in it                ②Boil the water for some time
③Put some clean iron nails in the tube        ④Add some oil to the water
  A. ①②                  B. ①③                 C. ②③                D. ②④
3. We can conclude from the experiment that only ____________ makes iron rusty.
A. keep the air dry                            
B. keep the tube wet
C. make the nails rust                          
D. keep the tube clean