( )1. pilot single machine April
( )2. engineer athlete sentence garden
( )3. resolution question station examination
( )4. retire fire tired wire
( )5. build June cup student
minute bus use cup（U有几种读音）
多线程有几种实现方法？同步有几种实现方法？
类有几种访问权限?变量和方法有几种访问权限?分别是什么?
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