单项选择题
A.下方线圈两端不会产生磁感应电势
B.下方线圈两端产生磁感应电势,方向为左“-”右“+”
C.下方线圈两端产生磁感应电势,方向为左“+”右“-”
D.磁性材料内部的磁通取逆时针方向
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单项选择题
A.B.C.D.
A.
B.
C.
D.
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单项选择题
Pollution regulations require that each scupper in an enclosed deck area have a ______.A.Wooden plugB.Soft rubber plugC.Two-piece soft patchD.Mechanical means of closing
A.A.Wooden
B.Soft
C.Two-piece
D.Mechanical
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