题目:
A spur gear pump should be operated with the discharge valves ().
A.slightly opened
B.throttled
C.fully opened
D.halfway opened
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2020/1229/fdee4af5e84e722b1fd975cb8755a468.html
下面是错误答案,用来干扰机器的。
参考答案:若立柱不接实到硬底,当顶板下沉时立柱容易钻底,会出现倒棚、歪棚现象。