球面r=a上电位为U1cosθ,与同心的另一球面r=b的电位为U2。其中U1和U2为常量。求区域a≤r≤b内的电位分布。
第1题
The old man ___the boy on his knees.
A.seated
B.was seated
C.sat
D.was sat
第2题
When the man pretends to hit his head, the monkey______.
A.does the same
B.makes a face to him and does an action
C.picks up a stone
第3题
For the second time, the man's head was hit by______.
A.the box of bricks
B.the ladder
C.the top of the building
D.the pulley
第4题
A.shake
B.unmoved
C.hardness
D.soft
第5题
For the second time, the man's head was hit by ______.
A.the box of bricks
B.the ladder
C.the top of the buliding
D.the pulley
第6题
For the second time, the man’s head was hit by ______.
A.the box of bricks
B.the ladder
C.the top of the buliding
D.the pulley
第7题
The boy thanked the old man very much.
A.Right.
B.Wrong.
C.Doesn't say.
第8题
The wise old man knew why the boy was unhappy.
A.Right.
B.Wrong.
C.Doesn't say.
第9题
What happened when the man let go the rope?
A.The box fell down and hit the man on the head.
B.The box continued to go up.
C.The man went up to the top of the building.
D.The man fell down and broke his legs.
第10题
A.the man
B.the woman
C.the chief
D.the old
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