37极重度精神发育不全的智商为:( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
精神发育迟滞是指起病于____岁以前.智商低于____,有不同程度的____困难,根据其严重程度可分为4级,各级IQ为轻度____、中度____、重度____和极重度____。
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