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【单选题】
碳化灰砂砖的容重为（）kg/m3
A.
1500-1700
B.
1700-1800
C.
1800-1900
D.
2000-2200
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】蒸压灰砂砖（GB 11945—1999）标准规定，蒸压灰砂砖产品型式检验项目包括（）。
A.
尺寸偏差和外观质量
B.
颜色
C.
抗压强度和抗折强度
D.
技术要求中的全部项目
【单选题】Passage Three In recent years there has been an increasing number of large oil spills. These spills, some of which have occurred directly at the site of extraction and others during tran...
A.
immediately
B.
after quite a long time
C.
few years later
D.
after several months