(单选题)7: 蓄电池在补充充电过程中，第一阶段的充电电流应选取其额定容量的
A: 1/10
B: 1/15
C: 1/20
D: 1/25
1.(单选题)若集合A＝{a，{a}，{1，2}}，则下列表述正确的是()． A.{a，{a}}A B.{1，2}...
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