油浆下返塔进入分馏塔底液面上方。
参考答案:错
解析:油浆下返塔进入分馏塔底液相中。
—Are the pencils in the box?
—________. [ ]
A. Yes, it isn't
B. No, they aren't
C. They aren't
D. It is
简述国内生产总值在行情研究中的作用。