封闭环是在装配过程中最后自然形成的尺寸，或者说是间接获得的尺寸。( )
参考答案：对
Finding her car stolen, ______. [ ]
A. a policeman was asked to help
B. the area was searched thoroughly
C. it was looked for everyone
D. she hurried to a policeman for help
如果触电者已停止呼吸，在医护人员未到来之前，应对触电者进行（）。
A.口对口人工呼吸
B.胸外心脏按压法
C.通知家属
D.通知单位
