单位重量液体通过泵所获得的能量增加叫()
A.扬程
B.流量
C.压力
D.功率
参考答案:A
Throughout the week, the boy _____most of the work in the manager’s office.
A.took on
B.took off
C.took in
D.took over
根据以上骨盆所测各径线,应考虑为
A.骨盆入口平面狭窄
B.骨盆出口平面狭窄
C.中骨盆狭窄
D.中骨盆及出口平面狭窄
E.骨盆三个平面狭窄