对于裂解制气用的原料重油,不利于制气的因素为( )。
A.灰分含量低 B.黏度大 C.含硫量低 D.C/H比低
参考答案:B
______is expected, according to the online survey, is that house prices will not go up any more.
A.As
B. It
C. Which
D. What
玻璃生产过程中退火起什么作用?