ОБЗОР ГРАММАТИЧЕСКИХ ТЕМ (ПГС)

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(ТЕКСТЫ 2-й И 3-й ЧАСТЕЙ)

A	1. The designer must be able to select and adapt materials of construction. 2. In choice of materials the civil engineer must consider many factors. 3. Portland cement can be modified to suit a particular application. 4. The most important building materials may now be considered to be structural steel and concrete. 5. Concrete may be considered an artificial conglomerate. 6. In proportioning concrete or mortar careful attention must be given to the selection of cement, aggregate and water.
B	1. desired properties 1. a material containing alumina 2. widely used 2. increasing variety 3. required quantities 3. Sulphate resisting cement 4. tests made on concrete 4. cementing material 5. crushed stone 5. measuring device 6. 6. Rapid hardening Portland cement
C	1. Timber, steel and concrete vary in properties. 2. Even steel varies in its microstructure. 3. The scope of purpose-made cements has led to the development of its different types. 4. This method of measuring proportions in volumes is widely used in large building construction. 5. The chief inaccuracies in volumetric measurement arise from variation in the bulk of fine aggregate.
D	1. in proportioning concrete and mortar mixes 2. method of measuring proportions 3. method of filling measuring devices 4. the capacity of hardening 5. for the purpose of binding together masonry units

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