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【单选题】
一般情况下物体之间的滚动摩擦力？A.
等于滑动摩擦力
B.
大于滑动摩擦力
C.
小于滑动摩擦力
D.
不确定
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】— Did you see what the thief looks like? — No, so quickly_______ that I couldn't see him clearly. [ ]
A.
did he run away
B.
ran away he
C.
does he run away
D.
he runs away
【单选题】—Did you see who the driver was? —No, so quickly, that I couldn’t gat a good look at his face.
A.
did the car speed by
B.
the car sped by
C.
does the car speed by
D.
the car speeds by
【单选题】Where __________ you this afternoon? I didn't see you. [ ]
A.
were
B.
did
C.
are
D.
was
【单选题】---Did you go to see he play last night? ---Unluckily, I couldn’t it, But I am going to see it soom.
A.
do
B.
manage
C.
make
D.
take
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