Вопрос № 95145 - Английский язык

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Prestressed concrete is a relatively young product. It started to be widely used only during the last few decades, and is still gaining popularity. The reason of its popularity is its usefulness. The main good qualities of prestressed concrete are its high strength and durability. In prestressed concrete, concrete is combined with steel. This combination is highly advantageous. It serves the purpose of producing a compressed stress in the concrete as a building material. For this reason any member of beam is under constant compression and as a result has no cracks. In modern times this type of concrete serves as construction material for beams, for pipes, and columns, storage tanks, water towers and the like.
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The reason of popularity of prestressed concrete is …

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Prestressed concrete is a relatively young product. 1_______. The reason of its popularity is its usefulness. 2_______. In prestressed concrete, concrete is combined with steel. 3_______. For this reason any member of beam is under constant compression and as a result has no cracks. 4_______.

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weather

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Excuse me.

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Safe operation of freight and passenger trains requires a system of signaling. To inform the locomotive and train crew of the position of other trains in relation to their own, signals installed at frequent intervals give indications which are visible both by day and by night. Wayside signals installed along railroad tracks are called fixed signals.

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I didn’t have an umbrella, so Helen gave me _______.