题目内容
我国交流电的频率为50Hz,其周期为( )秒。
2024-09-22
A.0.01
B.0.02
C.0.1
D.0.2
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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68479' and id < 4421543 and id<>'4421543' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68479' and id > 4421543 and id<>'4421543' order by id asc limit 5