题目内容

刺激阈值是指

A. 用最小刺激强度,刚刚引起组织兴奋的最短作用时间
B. 刺激时间不限,能引起组织兴奋的最适刺激强度
C. 保持一定的刺激时间和强度-时间变化率不变，引起组织发生兴奋的最小刺激强度
D. 保持一定的刺激强度不变，能引起组织兴奋的最适作用时间

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更多问题

在内外环境因素作用下，细胞具有产生膜电位变化的能力或特性，称为：

A. 兴奋性
B. 适应性
C. 传导性
D. 以上都不对

Main idea of part II

The text tells us that Margie, a girl who is aged 11 in 2157, always ___ school because her teacher is a _ one and she has to learn at regular hours and put her ______________ into a slotin the _. It also tells us how _ she is _ the children who studied together, experienced ___, and had _ teachers about two hundred years earlier.

文件型病毒传染的对象主要是()类文件.

A. .DBF
B. .DOC
C. .COM和.EXE
D. .EXE和.DOC