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【单选题】
在磁感强度为B的均匀磁场中作一半径为r的半球面s，s边线所在平面的法线方向单位矢量n与B的夹角为仅，则通过半球面s的磁通量（取弯面向外为正）为（）。A.
r2B
B.
2r2B
C.
-πr2Bsinα
D.
-πr2Bcosα
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举一反三
【单选题】Mrs. Taylor has 8-year-old daughter who has gift for painting – she has won two national prizes .
A.
a ; a
B.
an ; the
C.
an ; a
D.
the ; a
【单选题】Mrs. Taylor has ____ 8-year-olddaughter who has ____ gift for painting. [ ]
A.
a; a
B.
an; the
C.
an;.a
D.
the; a
【简答题】Mrs. Taylor has completed a study on bird’s nests.
【单选题】Mrs. Taylor has ___ 9-year-old daughter who has ___ gift for painting—she has won two national prizes.
A.
a; a
B.
an; the
C.
an; a
D.
the; a
【单选题】Mrs. Taylor has eight-year-old daughter who has gift for painting.
A.
a;a
B.
an;the
C.
an;a
D.
the;a
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