从原理来讲反转时可以反向吸、排的泵是()。
A.离心泵
B.闭式旋涡泵
C.水环泵
D.B和C
参考答案:B
The nurse is assessing a client who gave birth yesterday. Where should the nurse expect to find the top of the client’s fundus
A. One fingerbreadth above the umbilicus.B. One fingerbreadth below the umbilicus.C. At the level of the umbilicus.D. Below the symphysis pubis.
国标规定SDH设备在光缆线路出现下列情况下应即倒换()。
A.链路故障
B.帧丢失(LOF)
C.传输出现告警
D.其他