Which of the following statements is NOT true?（）
A. Canute was chosen by the Witan as king of England.
B. Canute was a warrior king and fought many battles against the Normans.
Canute divided power between Danes and Saxons.
D. Canute forced Malcolm II,king of the Scots,to recognize him as overlord.
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人流术后患者要求放环，有关放环的时间，下列哪项不正确（）
A. 月经干净后3～7天
B. 人流后子宫出血不多可立即放置
C. 顺产满3个月后
D. 剖宫产满半年
E. 人流术后月经未来潮者需先排除早孕
已知通过一匝数为10的线圈磁通量原为5×10－4Wb，在0.001s内变为1×10－4Wb，则该线圈能产生的平均感应电动势为（）。
A. 0.05V
B. 0.4V
C. 5V
D. 4V
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