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多项选择题

Many people think that a sense of competition in children should be encouraged. However, this essay argues that children who are taught to co-operate rather than compete will become more successful in their future career.

A．Definition
B．Cause and effect
C．Personal narrative
D．Description

问答题

由取代基的体积、数量、位置所引起的效应称为（    ），它对单体聚合能力有显著影响，但它不涉及对活性种的选择。