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【單選題】
一個帶+3q和一個帶-q的大小完全相同的金屬球，相距為r時作用力為F，若把它們相接觸后再放到相距為r的地方，假設兩種情況下金屬球上的電荷都是均勻分布的，這時它們之間的作用力的大小將變為：
A.
![]()
B.
![]()
C.
F
D.
3F
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舉報參考答案：
舉一反三
【單選題】There is a peaceful and calm _____ in the country, quite different from that of a big city.
A.
atmosphere
B.
climat e
C.
system
D.
situation
【單選題】Which of the following is NOT a reason for children to show love and respect for parents?
A.
Parents bring up children.
B.
Parents give love and care to children.
C.
Parents educate children to be good persons.
D.
Parents pass away before children grow up.
【單選題】_____ you have worked out the first problem, you may go on to work on the second.
A.
Even if
B.
Unless
C.
Now that
D.
Though
【單選題】You’ll succeed ______ because you are always working hard.
A.
on time
B.
in time
C.
at times
D.
at the time
【單選題】What do you think “florists” do?
A.
They sell flowers.
B.
They make and sell bread.
C.
They offer enough room for having family parties.
D.
They sell special gifts for Mother’s Day and Father’s Day.
相關題目：
【單選題】There is a peaceful and calm _____ in the country, quite different from that of a big city.
A.
atmosphere
B.
climat e
C.
system
D.
situation
【單選題】Which of the following is NOT a reason for children to show love and respect for parents?
A.
Parents bring up children.
B.
Parents give love and care to children.
C.
Parents educate children to be good persons.
D.
Parents pass away before children grow up.
【單選題】_____ you have worked out the first problem, you may go on to work on the second.
A.
Even if
B.
Unless
C.
Now that
D.
Though
【單選題】You’ll succeed ______ because you are always working hard.
A.
on time
B.
in time
C.
at times
D.
at the time
【單選題】What do you think “florists” do?
A.
They sell flowers.
B.
They make and sell bread.
C.
They offer enough room for having family parties.
D.
They sell special gifts for Mother’s Day and Father’s Day.
參考解析：
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