Excludability---the property of a good whereby a person can be prevented from using it ...

IP屬地:黑龍江
Excludability---the property of a good whereby a person can be prevented from using it ...
常見的精神活性藥物都有什么效果贴浙? Psychoactive drug——用于改變注意烛占、記憶突琳、判斷力矾削、時間感漾橙、自我控制杈帐、情緒或知覺的物質(zhì) Sitmulant—— 提高身體和精神...