6.混凝土中的水泥漿，在混凝土硬化前起_________作用。(      )

A.膠結(jié)                                                            B.潤(rùn)滑和填充

C.保水                                                            D.提供早期強(qiáng)度

7.維勃稠度法測(cè)定混凝土拌合物流動(dòng)性時(shí)，其值越大表示混凝土的(      )

A.流動(dòng)性越大                                                 B.流動(dòng)性越小

C.粘聚性越好                                                 D.保水性越差 

8.普通混凝土抗壓強(qiáng)度測(cè)定時(shí)，若采用100mm×100mm×100mm的試件，試驗(yàn)結(jié)果應(yīng)乘以尺寸換算系數(shù)(      )

A.0.90                                                             B.0.95    

C.1.05                                                             D.1.00

9.大體積混凝土夏季施工時(shí)，宜加入的外加劑是(      )

A.減水劑                                                        B.早強(qiáng)劑

C.緩凝劑                                                        D.速凝劑

10.鋼結(jié)構(gòu)設(shè)計(jì)時(shí)，碳素結(jié)構(gòu)鋼以_________強(qiáng)度作為設(shè)計(jì)計(jì)算取值的依據(jù)。(      )

A.σ_p                                                              B.σ_s      

C.σ_b                                                              D.σ_0.2