【单选题】It is many years ____ we enjoyed ourselves on the great occasion.
【单选题】以蒸汽为供热介质的供热系统,热源出口处应检测、记录供汽压力、供汽温度、供汽流量、()参数
【单选题】_________ it takes many years to gain the skills of an expert.
A.
It is well known to us that
B.
As is known to us that
D.
That is well known to us
【单选题】商业银行是以获取利润为主要经营目标的金融机构,我国的商业银行() ①以国家控股银行为主体 ②能够以一定的股息和红利,向社会吸收资金 ③利润主要来源于存款业务 ④能够为我国经济建设筹集资金和分配资金,是社会再生产顺利进行的纽带