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water cement ratio
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发布时间：2022-01-07
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The strength of zinc phosphate cement is linearly related to its()
A．pH
B．powder-to-liquid ratio
C．fluoride content
D．glass content
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更多“water cement ratio”相关的问题
第2题
In mixing zinc phosphate cement，which clinical variable has the greatest effect on the str
ength of the cement()
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A．spatulation time
B．liquid-powder ratio
C．temperature ofthe mixing slab
D．number and size ofpowder increments
第3题
Portland cement is termed a hydraulic cement because its hardness develops by chemical reaction with .
A.Clay
B.Lime
C.Gypsum
D.Water
第4题
Portland cement is termed a hydraulic cement because its hardness develops by chemical reaction with_____.
A.Clay
B.Lime
C.Gypsum
D.Water
第5题
Which one of the following materials is usually be used to adjust the indoor temperature and humidity？ （)
A.water glass
B.cement
C.gypsum
D.lime
第6题
Plain concrete is formed from a hardened mixture of cement, water, fine aggregate, coarse aggregate （crushed stone or gravel), air, and often other admixtures.
第7题
Water glass can not be used for brushing or impregnation of （) to improve its weathering resistance.
A、clay bricks
B、Portland products
C、cement concrete
D、gypsum products
第9题
Plain concrete is formed from a hardened mixture o...
Plain concrete is formed from a hardened mixture of cement, water, fine aggregate, coarse aggregate (crushed stone or gravel), air, and often other admixtures. The plastic mix is placed and consolidated in the formwork, then cured to facilitate the acceleration of the chemical hydration reaction of the cement/water mix, resulting in hardened concrete. The finished product has high compressive strength, and low resistance to tension, such that its tensile strength is approximately one tenth of its compressive strength. Consequently, tensile and shear reinforcement in the tensile regions of sections has to be provided to compensate for the weak tension regions in the reinforced concrete element.
第10题
听力原文：One of the important materials used in the construction of buildings and roads is
听力原文： One of the important materials used in the construction of buildings and roads is cement. It is a powder made mainly from limestone and clay. Even though the ancient Egyptians and Romans used a kind of cement, it was not until 1824 that an English bricklayer developed cement strong enough for modern roads and buildings.
While the bricklayer was experimenting in his kitchen, he found that a mixture of limestone and clay that had been heated formed a substance. This substance became hard and stone-like as it cooled. When it was grounded into a fine powder, it could be stored.
When the powder was mixed with water, it made an excellent quality of cement that quickly hardened in sunlight or even under water, it made an excellent quality of cement that is used today.
(30)
A．An Egyptian.
B．A Roman.
C．A British.
D．A man named Blake.
