题目内容
( )组合可实现第4段速。
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( )组合可实现第7段速。
n. a tall machine with a long arm, used to lift and move building materials and other heavy objects; a large bird with long legs and a long neck
n.an untidy state; a lack of order or organization; violent behaviour of large groups of people
v.to protect sb./sth from attack; to say or write sth in support of sb./sth. that has been criticized
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