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【简答题】
PEMFC 的电极均为气体扩散电极,一般由 和催化层组成。
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反馈参考答案：
举一反三
【单选题】普萘洛尔治疗心绞痛的主要药理作用是
A.
阻断心脏β1受体，降低心肌细胞耗氧量
B.
加强心肌收缩力，加强心脏泵血功能
C.
扩张冠脉
D.
降血压，减低心脏前负荷
E.
降低左室壁张力
【简答题】“We started as a group of friends with the same problem: difficulty in our personal life to manage our time, being always in a hurry.” This thought was recently offered by Bruno to explain the origin ...
【单选题】His excuse for being late this morning was his car had ______ in the snow.
A.
started up
B.
got stuck
C.
set back
D.
stood by
【单选题】His father, a famous university professor, who is said to have started his teaching career in Australia, _____ in Nanjing University for more than twenty years.
A.
has worked
B.
worked
C.
is working
D.
will work
【简答题】A small group of people around the world have started implanting(移植) microchips to link the body and the computer. Mr. Donelson and three friends, who had driven 100 miles from their homes in Loekport...
【简答题】He started his career working for a television station.
【单选题】下列哪项不是由雌激素减少所导致的
A.
促钙和磷沉积作用减弱
B.
促骨基质合成功能减弱
C.
拮抗甲状旁腺素作用减少
D.
降钙素分泌增加
E.
促进维生素D3合成及小肠钙吸收作用减小
【单选题】Mr. Li swimming for 3 hours, and his son an hour ago. [ ]
A.
has been; started
B.
have started; has started
C.
started; started
D.
has started; has started
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