第一产程活跃期的减速期,是指宫口扩张()
A.4~6cm
B.6~7cm
C.7~8cm
D.7~9cm
E.9~10cm
参考答案:E
Go ______ the bridge. You'll find the library on the left.[ ]
A. cross
B. across
C. through
D. past
胀接时胀紧程度的大小直接影响到管子与管板连接的强度,胀紧程度以管子内径增大率H来衡量,适合的内径增大率H=______。
A.0.1%~1%
B.1%~3%
C.4%~5%
D.6%~7%