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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.
不一定伴有胃肠平滑肉收缩
B.
决定了平滑肌收缩的频率
C.
降低了动作电位产生的阈值
D.
影响肌收缩的强度
参考答案：
参考解析：
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举一反三
【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.