【单选题】【消耗次数:1】
There [填空] seven days in a week.
are
is
have
has
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相关题目
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①  a
②  the
③  an
④  /
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①  for
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①  has she
②  hasn’ t she
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①  正确
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【多选题】 利用强度条件进行强度校核时,需要已知()。
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①  正确
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①  正确
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