题目内容
(请给出正确答案)
[主观题]
They ____________ a very large old country house a few miles from Cambridge
A.recently bought
B.have recently bought
C.had recently bought
D.had been buying
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A.recently bought
B.have recently bought
C.had recently bought
D.had been buying
第8题
A.公称尺寸不大于DN50的镀锌钢管采用螺纹连接
B.燃气用铝塑复合管可用于工作压力小于10Kpa、且环境温度不高于60℃的户外集中表箱后
C.不推荐使用无缝钢管材质的燃气管道进行暗埋
D.不锈钢软管用于暗埋形式敷设或穿墙时,应有外包覆层
E.室内采用薄壁不锈钢管时,其厚度不应小于0.5mm
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