当原料配比正常,但二段炉出口CH4含高,温度低表明一段炉反应好。
参考答案:错
解析:当原料配比正常,但二段炉出口CH4含量高,温度低表明一段炉反应不好。
Diana isn’t here, ______ leave a message on her desk.
A. or B. so D. and D. but
—Your father was worried about something this morning, why?
—He wanted to know _____.[ ]
A. where he could mend the television
B. why he mend the television
C. that he mended the television
D. how did he mend the television