航空轮胎径向间隙
参考答案：
使用后胀大的轮胎，其断面最高处与飞机相邻部件之间允许的距离
—I'm very sorry I didn't call you last night.
—____ I guess you were busy. [ ]
A. I'm sorry, too.
B. It's nothing.
C. You are so nice.
D. Excuse me.
下列属于无组织排放源的是（）。
A.露天环境中具有无组织排放的设施
B.无组织排放的建筑构造(如车间、工棚等)
C.露天煤场
D.露天干灰场
