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【判断题】
为了使活塞工作过程中具有合理的间隙和良好的密封，活塞通常做成椭圆形和锥形。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】My sister met him at the street yesterday afternoon, so he __________ your lecture.
A.
shouldn’t have attended
B.
couldn’t have attended
C.
mustn’t have attended
D.
needn’t have attended
【简答题】婴幼儿缺铁性贫血最常见的原因为 ,成人缺铁性贫血的最常见的原因是 。
【单选题】My sister met him at the Grand Theatre yesterday aftemoon , so he _____ your lecture. [ ]
A.
couldn't have attended
B.
needn't have attended
C.
mustn't have attended
D.
shouldn't have attended
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