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常用砌筑砂浆有___、_、和____三种。

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The author implies that the government should______.

A. be a part of the problem
B. encourage the development of alternative fuels
C. learn a lesson from the coal miners and react with derision
D. investigate the existence of dinosaur fossils

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常用砌筑砂浆有_____、_____、和______三种。

The author implies that the government should______.

自身重量由楼板或梁承担的墙是()

简述混凝土的收缩与水泥用量及水灰比的关系

热扎直条光圆钢筋强度等级代号为()

常用砌筑砂浆有___、_、和____三种。