[单选] If a centrifugal pump were continually operated with the discharge valve closed, the （）.
A . motor controller overload would open B . pump would eventually overheat C . relief valve would continuously cycle open D . motor would overheat
论述传输设备个单板运行灯（RUN）的几种状态和各状态的含义。
LT-D03A2/B2油水界面仪是用于低界面时（）收油阀。 开。 关。 连续关。 不一定。
控制爆破的缓冲原理是指多打眼、少装药，多段起爆。
控制爆破的微分原理是指总药量分散化和微量化。
梨和苹果的可食部分由（）发育而来。 花托和花被。 子房壁。 子房和胚珠。 花萼和胚珠。
If a centrifugal pump were continually operated with the discharge valve closed, the （）.
