SW-220K转向架的轴箱定位刚度横向刚度为()。
A.3.5~4.5MN/m
B.5.5~6.5MN/m
C.6.5~7.5MN/m
D.7.5~8.5MN/m
参考答案:A
26岁初产妇,妊娠37周,规律宫缩7小时,宫口开大3cm,未破膜,枕左前位,估计胎儿体重2550g,胎心148次/分,骨盆外测量未见异常。
若宫口已开全,胎头拨露达半小时,此时处理应是()
A.肌注哌替啶100mg
B.静滴葡萄糖液内加维生素C
C.静脉滴缩宫素
D.会阴侧切,产钳助娩
E.立即剖宫产
I think the MP3 is very helpful. It ______for listening to music. [ ]
A. is used
B. uses
C. was used
D. used