对下面的解释选择合适的名词
每搏量占舒张末期容量的百分数
A．射血分数B．心排出量C．心排血指数D．搏出量E．心室舒张末期容量
参考答案：A
Tom is now in our class, but he once _____ in Westbrook High School for a term. [ ]
A. has studied
B. studied
C. had studied
D. studies
如果把两个相等的泥球中的一个压成饼状，儿童认为饼状的泯虽面积大但变薄了，所以两者还是一样，这种认识属于（）.
A.补偿关系认知
B.互反可逆性
C.反演可逆性
D.类别体系化
