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【单选题】
神经元兴奋时,首先爆发动作电位的部位是A.
树突
B.
胞体
C.
轴丘
D.
轴突始段
E.
轴突末梢
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皮皮学刷刷变学霸
举一反三
【单选题】Thousands of Irish people starved during the “Potato Famine” because
A.
they were so dependent on potatoes that they refused to eat anything else
B.
they were forced to leave their homeland and move to America.
C.
the potato harvest was bad
D.
the weather conditions in Ireland were not suitable for growing potatoes.
【单选题】Thousands of Irish people starved because __________ 查看材料
A.
they depended on the potato
B.
they were forced to move to America
C.
the weather conditions in Ireland were not fit for growing the potato
D.
the potato harvest was bad
【单选题】如图所示电路中含有理想变压器，一次侧匝数为N1，二次侧匝数为N2，n=N1/N2。当一次侧由电流源is激励时，在保持一次侧匝数不变的前提下，若要使得R2上的功率增加，二次侧匝数N2应_________【图片】
A.
增加
B.
减少
C.
不变
D.
不能确定
【单选题】终碛堤是冰川携带物堆积在冰川末端形成的堤状堆积体。当冰川融水流过终碛堤后,冰水携带大量碎屑物质堆积成扇形堆积体,称为冰水扇。下图示意终碛堤及冰水扇,据此完成第1-2题。 1. 终碛堤沉积物具有的特点是( )
A.
大小均匀
B.
层状结构
C.
棱角明显
D.
磨圆度好
【简答题】回弹法检测单个构件混凝土强度时，结构或构件的混凝土强度推定值等于构件中最小的测区混凝土强度换算值。( )
【简答题】Thousands of Irish people starved during the'Potato Famine'because
【简答题】Starved for two whole days, they are a plague of locusts _________all the plates of food with one bite.
【简答题】Thousands of Irish people starved during the “Potato Famine” because
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