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【單選題】
一質(zhì)量為4kg的滑塊，以4m/s的速度在光滑水平面上向右滑行，從某一時刻起，在滑塊上作用一個向左的水平力，經(jīng)過一段時間，滑塊的速度方向變?yōu)橄蜃螅笮∪詾?m/s，在這段時間里水平力做的功為（ ）
A.
0
B.
8J
C.
16J
D.
32J
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舉報參考答案：
舉一反三
【單選題】We usually take turns _______cleaning, and today it is my turn______ it.
A.
to do; doing
B.
do; do
C.
done; doing
D.
to do; to do
【單選題】Eating more and sleeping less________.
A.
can keep healthy
B.
is no good for you
C.
gets you more energy
D.
will keep your personality
【單選題】The writer explains ________in this passage.
A.
how to eat
B.
the importance of doing exercise
C.
how to keep healthy
D.
what to eat
【單選題】When did Les Paul become the most popular guitarist?
A.
In the 1930s.
B.
In the 1940s.
C.
In the 1950s.
【單選題】What is the suitable topic of the passage?
A.
The first use of electric guitar.
B.
Les Paul the first user of electric guitar.
C.
The Gibson Guitar Company made the electric guitars.
相關(guān)題目：
【單選題】We usually take turns _______cleaning, and today it is my turn______ it.
A.
to do; doing
B.
do; do
C.
done; doing
D.
to do; to do
【單選題】Eating more and sleeping less________.
A.
can keep healthy
B.
is no good for you
C.
gets you more energy
D.
will keep your personality
【單選題】The writer explains ________in this passage.
A.
how to eat
B.
the importance of doing exercise
C.
how to keep healthy
D.
what to eat
【單選題】When did Les Paul become the most popular guitarist?
A.
In the 1930s.
B.
In the 1940s.
C.
In the 1950s.
【單選題】What is the suitable topic of the passage?
A.
The first use of electric guitar.
B.
Les Paul the first user of electric guitar.
C.
The Gibson Guitar Company made the electric guitars.
參考解析：
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