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问题 选择题

甲通草球带8×1010个正电荷，乙通草球带6×1010个负电荷，两球充分接触后再分开，则（　　）

A．甲带正电，乙带负电

B．甲带负电，乙带正电

C．甲乙都带正电

D．甲乙都带负电

答案

答案：C

选择题

25．Children  often form some bad habits, ____________remain with them as ling as they live.

A．some of them

B．some of which

C．any of them

D．any of which
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单项选择题

吗啡易引起

A．快速耐受性
B．成瘾性
C．耐药性
D．反跳现象
E．高敏性
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