正常生产中原料气和蒸汽压差太大何不好?
参考答案:
⑴一种气体压力太大,可造成另一种原料进不去;
⑵特别是原料气压力等于蒸汽压力后果更为严重,会使炉管结碳。
Sarah a funny story now.
A.is reading
B.looking at
C.is read
D.are watching