送到工地的混凝土拌合物流动性偏小，难以施工，此时可以用下列( )项的办法加以调整
A. 加入适量的水
B. 加入适量的水泥
C. 加入适量的砂子
D. 按原混凝土的水灰比，同时加入适量的水和水泥
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以下哪个对外展隙的生理意义阐述不正确
A. 自洁作用
B. 咀嚼时排溢食物
C. 保护牙槽骨和邻面
D. 食物通过时摩擦牙面
E. 扩展牙龈缘
After how many minutes does an average person repeat the sleep cycle
A. 8 to 15 minutes.
B. 30 minutes.
C. 40 to 60 minutes.
D. 80 minutes.
What can be inferred from the passage
A. Harlem was the poorest district in Manhattan.
B. White New Yorkers had no influence on Harlem's history.
C. All Blacks wished to settle in this promised land.
D. Harlem was highly regarded by Blacks.
免疫组织化学染色，淀粉酶阳性的涎腺肿瘤是
A. 多形性腺瘤
B. 嗜酸性腺瘤
C. 腺样囊性癌
D. 腺泡细胞癌
E. 粘液表皮样癌
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