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【多選題】

兩個(gè)放在絕緣架上的相同金屬球,相距r,球的半徑比r小得多,帶電量大小分別為q和3q,相互斥力為3F。現(xiàn)將這兩個(gè)金屬球相接觸,然后分開(kāi),仍放回原處,則它們之間的相互作用力將變?yōu)椋?)

A.
F
B.
4F/3
C.
4F
D.
以上三個(gè)答案之外的一個(gè)值
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參考答案:
舉一反三
【單選題】The author thinks that________.
A.
there is no way to get children to help at home
B.
the more encouragement and praise you give, the more responsible and helpful children will become
C.
it is very difficult to make children responsible for housework
D.
children can be forced to help with housework
【單選題】Which of the following is NOT mentioned about the Shanghai English Speaking Competition?________.
A.
Where and when it will take place.
B.
Its program.
C.
What each winner will be offered.
D.
The number of its competitors.
【單選題】An “off- hand speech” is________.
A.
a speech not longer than three minutes
B.
a speech without preparation
C.
a speech with a piece of paper in hand
D.
a speech which is well prepared
【單選題】The whole passage deals with ________.
A.
social education
B.
school education
C.
family education
D.
pre - school education
【單選題】Suppose you get the sixth place, you’ll________ .
A.
travel to London for free.
B.
become a one - year member of IATEFL
C.
get some money , some books and a certificate
D.
get a chance to study in Singapore
相關(guān)題目:
【單選題】The author thinks that________.
A.
there is no way to get children to help at home
B.
the more encouragement and praise you give, the more responsible and helpful children will become
C.
it is very difficult to make children responsible for housework
D.
children can be forced to help with housework
【單選題】Which of the following is NOT mentioned about the Shanghai English Speaking Competition?________.
A.
Where and when it will take place.
B.
Its program.
C.
What each winner will be offered.
D.
The number of its competitors.
【單選題】An “off- hand speech” is________.
A.
a speech not longer than three minutes
B.
a speech without preparation
C.
a speech with a piece of paper in hand
D.
a speech which is well prepared
【單選題】The whole passage deals with ________.
A.
social education
B.
school education
C.
family education
D.
pre - school education
【單選題】Suppose you get the sixth place, you’ll________ .
A.
travel to London for free.
B.
become a one - year member of IATEFL
C.
get some money , some books and a certificate
D.
get a chance to study in Singapore
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