根据我国企业所得税法的规定，下列（）应当缴纳企业所得税。
A. 合伙企业
B. 独资企业
C. 个体工商户
D. 股份制企业
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当线圈的匝数，电压不变时，电源频率增高，铁芯中磁通会（）。
A. 减少
B. 增加
C. 不变
You notice a performance change in your production Oracle 12c database. You want to know which change caused this performance difference. Which method or feature should you use?（）
A. Compare Period ADDM report
B. AWR Compare Period report
C. Active Session History (ASH) report
D. Taking a new snapshot and comparing it with a preserved snapshot
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