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【单选题】
产生抑制性突触后电位 (IPSP) 的主要机制是A.
突触前末梢释放减少
B.
突触后膜发生超极化
C.
突触后膜 Na + 降低
D.
中间神经元受抑制
E.
. 突触前膜 Ca 2+ 内流减少
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举一反三
【单选题】Where is the Choke located?
A.
At the Drilling Spool
B.
Connected to Ram outlet
C.
At the Choke Manifold
D.
At the Standpipe manifold
【简答题】使用起动机时,每次起动时间不能超过几秒,两次起动之间的时间间隔应大于多少秒
【单选题】Hearing her mean words，I stood there trembling and trying to ________ tears. [ ]
A.
choke out
B.
choke in
C.
choke back
D.
choke up
【单选题】choke
A.
to speak with a very loud voice
B.
to stop breathing because something is in the throat
C.
a flat bone on each side of the back
D.
something which is very important and must be dealt with before anything else
E.
simple medical treatment that is given as soon as possible to someone who is injured
F.
a hard hit with someone’s hand or a tool
【单选题】两级放大电路,A u1 =-40,A u2 =-50,若输入电压U i =10mV,则输出电压U o 为( )。
A.
-20V
B.
20V
C.
10V
D.
-10V
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