【单选题】Which of the following choices is the most appropriate ?
【简答题】升高温度和加入催化剂都能使反应速率加快,但前者的主要原因是 _______________ ,后者的主要原因是 ________________ 。
【简答题】升高温度和加入催化剂都能使反应速率加快,前者的主要原因是________,后者的主要原因是________。
【单选题】A 60-year-old man, a heavy smoker, presents for advice to stop smoking. On physical examination, he is thin and has a ruddy complexion. He has a productive cough and a barrel-shaped chest. He sits lea...
A.
Bronchial smooth muscle hypertrophy with proliferation of eosinophils
B.
Diffuse alveolar damage with leakage of protein-rich fluid into alveolar spaces
C.
Dilation of air spaces with destruction of alveolar walls
D.
Hyperplasia of bronchial mucus-secreting submucosal glands
E.
Permanent bronchial dilation caused by chronic infection, with bronchi filled with mucus and neutrophils
【单选题】在氯酸钾里加入少量高锰酸钾后,加热制取氧气的速率可以大大加快。你认为其主要原因是 [ ]
D.
高锰酸钾受热易分解,产物中有可作为氯酸钾分解反应的催化剂
【单选题】Which of the following is not the advice Ruby gave to Ian?
B.
Writing down the deadline.
C.
Doing the most important tasks.
【简答题】实验证明增大反应物的浓度,反应速率加快,原因是 。升高温度使反应速率加快的原因是 。加入催化剂使反应速率加快的原因是 。
【单选题】风湿病中,属于物理疗法抗风湿的方法是( )