效度系数的实际意义常常以决定系数来表示，如测验的效度系数是0.80，则效标的总方差中

阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填人一个适当的词或使用括号中词语的正确形式填空，并将答案填写在答题卡标号为26～35的相应位置上。

This happened in a third-grade classroom. Jim sat  26 his desk and all of a sudden, there was a puddle(一滩水) between his feet and the front of his trousers was wet. He felt his heart was going to stop. He knew   27  would happen when his classmates found out. He looked up and there came the teacher with   28  look in her eyes that said he   29  (discover).

As the teacher was walking towards   30 , a classmate named Susie was carrying a goldfish bowl full of water to her desk. Suddenly, Susie tripped(绊倒) and,   31 (strange), dumped the whole bowl of water in Jim’s lap. He pretended to be angry, but all the while he was saying deep in his heart, “Thank you!”

Jim became the object of sympathy instead of ridicule. The teacher brought him gym shorts to put on. All the others crawled(爬) on their hands and knees,   32 (clean) up around his desk. But  33 life would have it, the ridicule that should have been his had been transferred(转移) to Susie. She tried to help,   34 they told her to leave the room   35  school was over, Jim walked over to Susie and whispered, “You did that on purpose, didn’t you?”

Susie whispered back, “I wet my trousers once, too!”

如图所示，图(a)和图(b)分别表示正弦脉冲波和方波的交变电流与时间的变化关系。若使这两种电流分别通过两个完全相同的电阻，则经过1 min的时间，两电阻消耗的电功之比W_甲：W_乙为____。

离婚损害赔偿

中国食物与营养发展纲要（2001-2010年）中所确定的“食物与营养发展的基本原则”是什么？

在数据流图中，圆圈符号表示的是（）

A.数据源点或终点

B.数据处理

C.数据存储

D.数据流