The children with moderate to severementalretardation maintain a progressively decreasing accuracy in their judgment of the increasingly difficult tasks.
中重度智力落后儿童对难度不同的任务的判断正确率随着实验难度的增加而降低。
2
Mn deficiency during pregnancy may impede the development of fetal bone can also affect the synthesis of hormones, leading to severementalretardation fetus.
孕期缺锰会阻碍胎儿骨骼发育，也可影响激素的合成，导致胎儿严重智力低下。
3
This report describes a female ease who is complete deletion of secondary constriction on two chromosomes 9. The major clinical phenomenon is severementalretardation.