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Much to our regret, we cannot at present entertain any fresh orders owing to the shortage

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碳素工具钢的牌号由“T+数字”组成，其中数字是以()表示的碳的质量分数。
A 百分数
B 千分数
C 万分数
D 十分数

枪孔钻的后角一般为()。
A 5度
B 10度
C 20度
D 40度

______(compare) with our small flat, Bills house seemed like a palace.

All of them stared at him carefully, as though______(try) to understand something.