锅炉的蒸汽参数是指锅炉干饱和蒸汽的压力和温度。
参考答案：错
— Did Jack come back early last night?
— Yes. It was not yet eight o'clock ______ he got home.[ ]
A. before
B. when
C. that
D. until
Some people hold that the more conservative the world becomes, ______ have old furniture, old houses and old paintings.
A. the smarter is toB. the smarter it is toC. is it the smarter soD. is one to the smarter
