A:蓄电池中含有汞,镉等重金属元素,不可随便丢弃
B:化学电池的铅电极板和电解液如果乱丢弃,也会造成环境污染
C:化学电池中含有汞、镉等重金属元素,不可随便丢弃
D:以上说法都不对
After such a long way, he is .
______some people are motivated by a need for success, others are motivated by a fear of failure.
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整数集合{ }
非负数集合{ }
分数集合{ }
无理数集合{ }.
如图,在五边形ABCDE和五边形A1B1C1D1E1中,如果AB=A1B1,BC=B1C1,CD=C1D1,DE=D1E1,EA=E1A1.请添加尽可能少的条件,使它们全等(写出添加的条件,不需要说明理由)