A client in her 7th month of pregnancy has been complaining of back pain and wants to know what can be done to relieve it. Which of the following responses by the nurse is most effective ？（）

A．"You need to lie down more during the day to get off your feet. "

B．"Avoid lifting heavy loads, and try using the pelvic tilt exercise. "

C．"Have others pick things up for you so you don't have to bend over so much. "

D．"Your back pain will go away after the baby is born. "

设备及传感器安装时检查接线腔和内部电器元件及连接线，要求应完好齐全，各连接插件接触良好，各紧固件应齐全、完整、可靠，同一部位的螺母、螺栓规格应一致。