Is chronic obstructive pulmonary disease a kind of common diseases?
查看答案
Doctors can use a spirometer to perform a quick breathing test to see if people have COPD.
A. 对
B. 错
COPD has 2 most common forms. They areand.
What is the pathogenic cause of COPD?
What is the pathogenic cause of COPD?
A. smoking
B. air pollution
C. genetic factors
D. bacteria infection
微信支付 
支付宝支付