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人骑自行车下坡,坡长l=500 m,坡高h=8 m,人和车总质量为100 kg,下坡时初速度为4 m/s,人不踏车的情况下,到达坡底时车速为10 m/s,g取10 m/s2,则下坡过程中阻力所做的功为( )
A.
-4000 J
B.
-3800 J
C.
-5000 J
D.
-4200 J
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参考答案：
C
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举一反三
When he was crossing the street, a car ______ and ______ he lay in bed for two months.
A.
knocked him down; as a result
B.
knocked down him; as a result
C.
knocked him down; for result
D.
ran him down; in result
I’m sorry , there’s no ______but to sell the car.
A.
choices
B.
choose
C.
preference
D.
alternative
I decide to pay a visit to you, but I don’t know whether it is quite _________ to you.
A.
convenient
B.
fair
C.
easy
D.
comfortable
He is short-sighted so it’s impossible for him to see the small bird _____.
A.
at a distance
B.
from the distance
C.
in the distance
D.
for the distance
She doesn’t answer the doorbell. She ______ be asleep.
A.
might
B.
should
C.
ought to
D.
had to
相关题目：
When he was crossing the street, a car ______ and ______ he lay in bed for two months.
A.
knocked him down; as a result
B.
knocked down him; as a result
C.
knocked him down; for result
D.
ran him down; in result
I’m sorry , there’s no ______but to sell the car.
A.
choices
B.
choose
C.
preference
D.
alternative
I decide to pay a visit to you, but I don’t know whether it is quite _________ to you.
A.
convenient
B.
fair
C.
easy
D.
comfortable
He is short-sighted so it’s impossible for him to see the small bird _____.
A.
at a distance
B.
from the distance
C.
in the distance
D.
for the distance
She doesn’t answer the doorbell. She ______ be asleep.
A.
might
B.
should
C.
ought to
D.
had to
参考解析：
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