用来表示冷冻机油低温流动性能的指标有凝固点、倾点、（）和低温粘度等。
A.滴点
B.烟点
C.露点
D.浊点
参考答案：D
_____ cleaning the yard and making up the beds for the old, we also read newspapers for
them and had chats with them. [ ]
A. Except for
B. Rather than
C. Apart from
D. Instead of
龙门刨工作精度检验及超差处理：龙门刨的工作精度检验是在不同长度的工作台上放置不同数目的试件，工作台长度L1≤2000mm时放置4件，（）放置6~8件
A．L1＞3000mm
B．L1＞4000mm
C．L1＞5000mm
D．L1＞2000mm
