第一产程活跃期的加速期，是指宫口扩张（）
A.0～3cm
B.3～4cm
C.4～9cm
D.6～7cm
E.7～8cm
参考答案：B
—What’s the woman with a ponytail like?
—She doesn’t talk much, _____________________.
A．she is a nurse
B．she is shy and quiet
C．she likes music
D．she is ten years old
等离子弧焊
