在输送温度高或沸点低的液体时,由于饱和蒸汽压(),而泵允许的安装高度往往很低,有时还 发布时间:2020-01-26 04:28 │ 来源:www.tikuol.com 题型:单项选择题 问题: 在输送温度高或沸点低的液体时,由于饱和蒸汽压(),而泵允许的安装高度往往很低,有时还会出现负A.高B.低C.为负D.为正值
题型:单项选择题 A strong earthquake hit Japan on March 11, _____ thousands of people homeless. [ ]A. to leave B. having leftC. leftD. leaving 查看答案