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【简答题】
汽车制动系至少装有两套各自独立的系统,一套是____,主要用于汽车行驶中的____和____,另一套是____,主要用于____,防止滑移。
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【单选题】--- Helen isn't old enough to look after ___.--- Don't worry. I can help her.
A.
she
B.
her
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hers
D.
herself
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A.
us
B.
him
C.
her
D.
them
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