裱糊加气混凝土板需基层处理方法有（）.
A.确定含水率；
B.刷洗或漂洗；
C.干刮；
D.干磨.
参考答案：A
对于湿跑道，所需着陆距离为干跑道实际着陆距离的（）。
A、1.667倍
B、1.15倍
C、1.917倍
The professor can hardly find sufficient grounds （） his argument in favour of the new theory.
A. which to base on
B. on which to base
C. to base on which
D. which to be based on
