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【判断题】
昆虫的头部是感觉和取食中心;胸部为运动中心;腹部为新陈代谢中心 。A.
正确
B.
错误
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举一反三
【单选题】Red-feather belts are the only acceptable specie for______.
A.
any kind of commerce
B.
certain traditional purchases
C.
new red-feather belts
D.
accumulating wealth
【单选题】The price-specie-flow mechanism
A.
is an automatic mechanism for assuring external balance under floating exchange rates.
B.
is an automatic mechanism for assuring external balance under the gold standard.
C.
is an automatic mechanism for assuring internal balance under floating exchange rates.
D.
is an automatic mechanism for assuring internal balance under the gold standard.
E.
is an automatic mechanism for assuring internal balance under mercantilism.
【简答题】The way that O2 and CO2 pass through the red blood cell membrane is ( ); the process of neurotransmitter release belongs to ( )
【单选题】The function of 2,3-BPG in red blood cells is
A.
lowering hemoglobin affinity for oxygen
B.
maintaining normal operation of the calcium pump on the red blood cell membrane
C.
m aintaining red blood cell volume and biconcave shape
D.
lowering hemoglobin affinity for CO 2
E.
increasing hemoglobin affinity for oxygen
【简答题】Low taxes which encourage business activity.() () c () n () () v () s __________
【单选题】Which of the following ways does O2 and CO2 enter and exit the cell membrane?
A.
Simple diffusion
B.
Facilitated diffusion
C.
Primary active transport
D.
Secondary active transport
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