火灾蔓延的途径是()
A.热传导
B.热对流
C.热辐射
D.以上都是
参考答案:D
— Have you made an apology____him ____breaking his window?
— Yes, I have. [ ]
A. for; to
B. to; to
C. for; for
D. to; for
为使推焦车一点定位,大容积焦炉采用()推焦串序。
A.2-1;
B.5-2;
C.9-2。