题目内容

枪孔钻的后角一般为()。
A 5度
B 10度
C 20度
D 40度

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

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

()其断口呈灰白相间的麻点状,性能不好,极少应用。
A 白口铸铁
B 灰口铸铁
C 球墨铸铁
D 麻口铸铁

It&39;s said that every country has its own social and______(economy) problems.

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