炼焦煤贮存时间太久,会产生害处,下列哪些说法是正确()
A、水分降低
B、煤容易自然
C、结焦性变差
D、煤会氧化
参考答案:B, C, D
——How well did John do in the match?
——Wonderful.I think we can’t have a _____ player in our football team.
A.good
B.well
C.better
D.best
压力变送器冬季应当做好保温工作,确保检测点的数据准确。()