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【多选题】
胃肠平滑肌的基本电节律叙述正确的是
A.
降低了动作电位产生的阈值
B.
不一定伴有胃肠平滑肌收缩
C.
决定了消化道平滑肌收缩的频率
D.
影响消化道平滑肌收缩的强度
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【单选题】Biological ClockWhen the sun rises on a warm and sunny day, you can see some flowers open up. When they close late in the afternoon, other flowers open.Biological rhythms（生物节律）, like the opening and c...
A.
But where can you find it?
B.
This makes them feel tired.
C.
In the summer they fly back to have babies.
D.
We are learning more and more about them.
E.
Biological clocks can be adjusted.
F.
Other rhythms are based on months, seasons or years.
【多选题】平滑肌的光镜结构特点是（）。
A.
肌纤维长梭形，大小不一
B.
无横纹
C.
核位于细胞中央
D.
收缩时核扭曲成螺旋形
E.
核两端的肌浆较丰富
相关题目：
【单选题】Biological ClockWhen the sun rises on a warm and sunny day, you can see some flowers open up. When they close late in the afternoon, other flowers open.Biological rhythms（生物节律）, like the opening and c...
A.
But where can you find it?
B.
This makes them feel tired.
C.
In the summer they fly back to have babies.
D.
We are learning more and more about them.
E.
Biological clocks can be adjusted.
F.
Other rhythms are based on months, seasons or years.
【多选题】平滑肌的光镜结构特点是（）。
A.
肌纤维长梭形，大小不一
B.
无横纹
C.
核位于细胞中央
D.
收缩时核扭曲成螺旋形
E.
核两端的肌浆较丰富
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