6.石灰的碳化反應(yīng)式是(      )

A.Ca(OH)₂+CO₂ ====== CaCO₃+H₂O

B.CaO+H₂O ====== Ca(OH)₂

C.Ca(OH)₂+CO₂+nH₂O ====== CaCO₃+(n+1)H₂O

D.CaCO₃ ====== CaO+CO₂

7.水玻璃中常摻用的硬化劑是(      )

A.NaF                                                             B.Na₂SO₄      

C.Na₂SiO₄                                                       D.Na₂SiF₆

8.測定水泥強度用的標準試件尺寸是_________mm。(      )

A.40×40×40                                                    B.40×40×100 

C.100×100×100                                               D.40×40×160

9.緊急搶修工程宜選用(      )

A.礦渣硅酸鹽水泥                                          B.普通硅酸鹽水泥

C.硅酸鹽膨脹水泥                                          D.快硬硅酸鹽水泥

10.混凝土配合比設(shè)計的三個主要技術(shù)參數(shù)是(      )

A.單方用水量、水泥用量、砂率                     B.水灰比、水泥用量、砂率

C.單方用水量、水灰比、砂率                         D.水泥強度、水灰比、砂率