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【单选题】
长直导线 MN 中,通有由 M 向 N 的电流,闭合导线圈 a 和 MN 在同一平面内.要使 a 中产生如图方向的感应电流,应采用的办法是A.
a不动，使MN中电流强度减小
B.
a不动，使MN中电流强度增大
C.
MN中电流保待恒定，使a平行于MN向右运动
D.
MN中电流保持恒定，使a向着MN运动
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A.
hold on
B.
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C.
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D.
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【单选题】------We got here on Tuesday afternoon. ----_____ Why didn’t you call us earlier?
A.
You are welcome
B.
Good luck!
C.
You did?
D.
It’s no surprise.
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【单选题】------We got here on Tuesday afternoon.
A.
----_____ Why didn’t you call us earlier?
B.
Good luck!
C.
You did?
D.
It’s no surprise.
E.
You are welcome
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