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【简答题】
图为某地区潜水等水位线图，读图回答下列各题。 小题1:关于该图叙述正确的是 A．图中箭头正确表示了潜水的运动方向 B．图中P点潜水的埋藏深度为10米 C．图中Q点的潜水位为20米 D．图示地区地形主要为山脊 小题2:要获得充足的地下水资源，图中打井最方便有利的地点为 A．① B．② C．③ D．④
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举一反三
【单选题】The effect of presynaptic receptor is
A.
promote the trafficing of vesicle.
B.
induce Ca2+ influx.
C.
promote the store of neurotranstters.
D.
promote the reuptake of neurotransmitters.
E.
regulate the release of neurotransmitters.
【单选题】presynaptic inhibition的发生是由于
A.
突触前膜兴奋性递质释放量减少
B.
突触前膜释放抑制性递质
C.
突触后膜超级化
D.
collateral inhibition
E.
中间抑制性神经元兴奋结果
【简答题】使内环境理化性质保持相对恒定的调节，属于
【单选题】It can be inferred that researchers abandoned the presynaptic hypothesis because______ .
A.
a new and more attractive hypothesis was suggested
B.
no research was reported that supported the hypothesis
C.
research results provided evidence to counter the hypothesis
D.
the hypothesis was supported only by studies of animals and not by studies of human beings
【单选题】The structural basis of presynaptic inhibition is
A.
Axon-axon synapse and axon-dendritic synapse
B.
Axon-cell body synapse and axon-cell body synapse
C.
Axon-axon synapse and axon-cell synapse
D.
Axon-dendritic synapse and axon-dendritic synapse
E.
Axon-axon synapse and axon-axon synapse
【简答题】图示机构在水平面内绕铅垂轴O转动，各齿轮半径为r 1 ＝r 3 ＝3r 2 ＝0.3m,轮质量为m 1 ＝m 3 ＝9m 2 ＝90kg，皆可视为均质圆盘。系杆OA上的驱动力偶矩M 0 ＝180N·m，轮1上的驱动力偶矩为M 1 ＝150N·m，轮3上的阻力偶矩M 3 ＝120N·m。不计系杆的质量和各处摩擦，求轮Ⅰ和系杆的角加速度。
【单选题】The effect of presynaptic receptor is
A.
regulate the release of neurotransmitters.
B.
promote the trafficing of vesicle.
C.
induce Ca2+ influx.
D.
promote the store of neurotranstters.
E.
promote the reuptake of neurotransmitters.
【单选题】Structural Basis of presynaptic inhibition is :
A.
Axo-axonic synapse
B.
Axo-dendritic synapse
C.
Axo-somatic synapse
D.
dendritic-somatic synapse
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