可逆要求是指中心要素的形位误差值小于给出的形为公差值时,允许在满足零件功能要求的前提下扩大尺寸公差的一种要求。
参考答案:对
After the flooding,people were suffering in that area,________ urgently needed clean water,medicine and shelter to survive.(2012·江苏,22)
A.which
B.who
C.where
D.what
下列哪项疾病咳出的痰分层
A.肺脓肿
B.大叶性肺炎
C.支气管哮喘
D.支气管炎
E.肺不张