异位妊娠是指（）。

A.受精卵着床于子宫以外

B.受精卵着床于子宫+附件以外

C.受精卵着床于子宫体腔以外

D.受精卵着床于腹腔以外

E.受精卵着床于宫颈管以外

The lifesaving signal indicating You are seen - assistance will be given as soon as possible is the（）.

A.vertical motion of white flags

B.vertical motion of a white light or flare

C.firing of a green star signal

D.None of the above